DO NOT MERGE: Exclude reactor and netty from azure-core and azure-core-http-netty libraries

[kushagraThapar]

• Since we depend on released versions of azure-core and azure-core-http-netty libraries, their released versions will depend on different netty versions than what we prefer to use.
• Excluding the netty versions from these dependencies since we are seeing issues like below :

This PR is reproducing these issues - #15671

2020-09-29 17:36:58,661       [main] INFO  com.azure.cosmos.TestNGLogListener - beforeInvocation: TestSuiteBase#beforeSuite
2020-09-29 17:36:58,669       [TestNG-method=beforeSuite-1] INFO  TestSuiteBase - beforeSuite Started
2020-09-29 17:36:58,747       [TestNG-method=beforeSuite-1] INFO  com.azure.cosmos.implementation.RxDocumentClientImpl - Initializing DocumentClient with serviceEndpoint [https://paged-flux-test-account.documents.azure.com:443/], connectionPolicy [ConnectionPolicy{requestTimeout=PT5S, connectionMode=GATEWAY, maxConnectionPoolSize=1000, idleHttpConnectionTimeout=PT1M, idleTcpConnectionTimeout=null, userAgentSuffix='', throttlingRetryOptions=RetryOptions{maxRetryAttemptsOnThrottledRequests=9, maxRetryWaitTime=PT33H20M}, endpointDiscoveryEnabled=true, preferredRegions=null, multipleWriteRegionsEnabled=true, proxyType=null, inetSocketProxyAddress=null, readRequestsFallbackEnabled=true, connectTimeout=null, idleEndpointTimeout=null, maxConnectionsPerEndpoint=0, maxRequestsPerConnection=0}], consistencyLevel [Session], directModeProtocol [Tcp]
2020-09-29 17:36:58,959       [parallel-1] INFO  com.azure.cosmos.implementation.RxDocumentClientImpl - Getting database account endpoint from https://paged-flux-test-account.documents.azure.com:443/
2020-09-29 17:36:59,156       [reactor-http-nio-1] WARN  io.netty.channel.DefaultChannelPipeline - An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception.
io.netty.channel.ChannelPipelineException: reactor.netty.resources.PooledConnectionProvider$PooledConnectionAllocator$PooledConnectionInitializer.handlerAdded() has thrown an exception; removed.
	at io.netty.channel.DefaultChannelPipeline.callHandlerAdded0(DefaultChannelPipeline.java:624) [netty-transport-4.1.52.Final.jar:?]
	at io.netty.channel.DefaultChannelPipeline.access$100(DefaultChannelPipeline.java:46) [netty-transport-4.1.52.Final.jar:?]
	at io.netty.channel.DefaultChannelPipeline$PendingHandlerAddedTask.execute(DefaultChannelPipeline.java:1463) [netty-transport-4.1.52.Final.jar:?]
	at io.netty.channel.DefaultChannelPipeline.callHandlerAddedForAllHandlers(DefaultChannelPipeline.java:1115) [netty-transport-4.1.52.Final.jar:?]
	at io.netty.channel.DefaultChannelPipeline.invokeHandlerAddedIfNeeded(DefaultChannelPipeline.java:650) [netty-transport-4.1.52.Final.jar:?]
	at io.netty.channel.AbstractChannel$AbstractUnsafe.register0(AbstractChannel.java:502) [netty-transport-4.1.52.Final.jar:?]
	at io.netty.channel.AbstractChannel$AbstractUnsafe.access$200(AbstractChannel.java:417) [netty-transport-4.1.52.Final.jar:?]
	at io.netty.channel.AbstractChannel$AbstractUnsafe$1.run(AbstractChannel.java:474) [netty-transport-4.1.52.Final.jar:?]
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164) [netty-common-4.1.52.Final.jar:?]
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472) [netty-common-4.1.52.Final.jar:?]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500) [netty-transport-4.1.52.Final.jar:?]
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) [netty-common-4.1.52.Final.jar:?]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.52.Final.jar:?]
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [netty-common-4.1.52.Final.jar:?]
	at java.lang.Thread.run(Thread.java:834) [?:?]
Caused by: java.util.NoSuchElementException: reactor.netty.resources.PooledConnectionProvider$PooledConnectionAllocator$PooledConnectionInitializer
	at io.netty.channel.DefaultChannelPipeline.getContextOrDie(DefaultChannelPipeline.java:1082) ~[netty-transport-4.1.52.Final.jar:?]
	at io.netty.channel.DefaultChannelPipeline.remove(DefaultChannelPipeline.java:417) ~[netty-transport-4.1.52.Final.jar:?]
	at reactor.netty.resources.PooledConnectionProvider$PooledConnectionAllocator$PooledConnectionInitializer.handlerAdded(PooledConnectionProvider.java:284) ~[reactor-netty-0.9.12.RELEASE.jar:?]
	at io.netty.channel.AbstractChannelHandlerContext.callHandlerAdded(AbstractChannelHandlerContext.java:938) [netty-transport-4.1.52.Final.jar:?]
	at io.netty.channel.DefaultChannelPipeline.callHandlerAdded0(DefaultChannelPipeline.java:609) [netty-transport-4.1.52.Final.jar:?]
	... 14 more

[kushagraThapar]

We are experimenting with taking full dependencies on azure-core and azure-core-http-netty through this PR - #16604
If everything works fine, we will close this PR and will go with the transitive dependencies.

[kushagraThapar]

Closing this PR, as the other solution worked well - #16604