Fix duplicate values in Monitor Spec

[sarangan12]

Issue

Sarangans-MacBook-Pro:azure-sdk-for-ruby saranganrajamanickam$ autorest --package-name=azure_mgmt_monitor  /Users/saranganrajamanickam/Projects/azure-rest-api-specs/specification/monitor/resource-manager/readme.md --namespace=Azure::Monitor::Mgmt::V2016_09_01 --title=MonitorClient --tag=package-2016-09-01-only --package-version=0.16.1 --output-folder=/Users/saranganrajamanickam/Projects/azure-sdk-for-ruby/management/azure_mgmt_monitor/lib/ --ruby --azure-arm
AutoRest code generation utility [version: 2.0.4280; node: v8.6.0]
(C) 2018 Microsoft Corporation.
https://aka.ms/autorest
   Loading AutoRest core      '/Users/saranganrajamanickam/.autorest/@microsoft.azure_autorest-core@2.0.4280/node_modules/@microsoft.azure/autorest-core/dist' (2.0.4280)
   Loading AutoRest extension '@microsoft.azure/autorest.ruby' (~3.1.26->3.1.38)
   Loading AutoRest extension '@microsoft.azure/autorest.modeler' (2.1.22->2.1.22)

ERROR (Fatal/DuplicateParameterCollision): Duplicated global non-identical parameter definitions
    - file:///Users/saranganrajamanickam/Projects/azure-rest-api-specs/specification/monitor/resource-manager/microsoft.insights/stable/2016-09-01/serviceDiagnosticsSettings_API.json:395:4 ($.parameters.ResourceUriParameter)
    - file:///Users/saranganrajamanickam/Projects/azure-rest-api-specs/specification/monitor/resource-manager/microsoft.insights/stable/2016-09-01/metrics_API.json:269:4 ($.parameters.ResourceUriParameter)
Process() cancelled due to exception : Cancellation requested.
  Cancellation requested.

Root Cause
ResourceUriParameter parameter is repeated in both files which should not happen.

Fix
Remove one of them and reference it in the other.

Post Fix

Sarangans-MacBook-Pro:azure-sdk-for-ruby saranganrajamanickam$ autorest --package-name=azure_mgmt_monitor  /Users/saranganrajamanickam/Projects/azure-rest-api-specs/specification/monitor/resource-manager/readme.md --namespace=Azure::Monitor::Mgmt::V2016_09_01 --title=MonitorClient --tag=package-2016-09-01-only --package-version=0.16.1 --output-folder=/Users/saranganrajamanickam/Projects/azure-sdk-for-ruby/management/azure_mgmt_monitor/lib/ --ruby --azure-arm
AutoRest code generation utility [version: 2.0.4280; node: v8.6.0]
(C) 2018 Microsoft Corporation.
https://aka.ms/autorest
   Loading AutoRest core      '/Users/saranganrajamanickam/.autorest/@microsoft.azure_autorest-core@2.0.4280/node_modules/@microsoft.azure/autorest-core/dist' (2.0.4280)
   Loading AutoRest extension '@microsoft.azure/autorest.ruby' (~3.1.26->3.1.38)
   Loading AutoRest extension '@microsoft.azure/autorest.modeler' (2.1.22->2.1.22)
Sarangans-MacBook-Pro:azure-sdk-for-ruby saranganrajamanickam$ git status
On branch master
Your branch is up-to-date with 'origin/master'.

nothing to commit, working tree clean
Sarangans-MacBook-Pro:azure-sdk-for-ruby saranganrajamanickam$

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The initial PR has been merged into your service PR:
Azure/azure-sdk-for-ruby#1435