[HTTP] [HTTP/2] Performance test for upgrade/downgrade scenarios

[ldclakmal]

Description:
Execute performance test for the upgrade and downgrade scenarios. Integrate them into the automation script of https://github.com/ballerina-platform/ballerina-performance/.

Following scenarios need to be tested:

• h1c_h2c_client_upgrade [h1c -> h1c_h2c -> h2c]
• h2c_h1c_client_downgrade [h1c -> h1c_h2c -> h1c]
• h2_h1_client_downgrade [h2 -> h2_h2 -> h1]
• h1_h2_server_downgrade [h1 -> h2_h2 -> h2]
• h1c_h2c_server_downgrade [h1c -> h2c_h2c -> h2c]

[ldclakmal]

Status:

• h1c_h2c_client_upgrade [h1c -> h1c_h2c -> h2c] - [HTTP/2] An error rate gets occurred in perf test done for http/2 client upgrade scenario (H1C_H2C_Client_Upgrade) #13927
• h2c_h1c_client_downgrade [h1c -> h1c_h2c -> h1c] - Done
• h2_h1_client_downgrade [h2 -> h2_h2 -> h1] - Done
• h1_h2_server_downgrade [h1 -> h2_h2 -> h2] - [HTTP/2] An error rate gets occurred in perf test done for http/2 server downgrade scenario (H2_H2_Server_Downgrade)  #13953
• h1c_h2c_server_downgrade [h1c -> h2c_h2c -> h2c] - [HTTP/2] An error rate gets occurred in perf test done for http/2 server downgrade scenario (H2C_H2C_Server_Downgrade) #13954

More info: https://docs.google.com/spreadsheets/d/1KfMXPbXbWIGbRNY4gtljRRIRqabhdUs8DHRLVaCM52k/edit?ts=5c667cb6#gid=279299373

[ldclakmal]

The issue #13927 and #13954 is not reproducible with Ballerina h2c backend. Need to improve netty echo backend [1] in order to support h2 content aggregation for h2c upgrade scenario. Issue [2] is created to track the requirement.

#13953 is get fixed with [3]

[1] https://github.com/wso2/performance-common
[2] wso2/performance-common#25
[3] wso2/performance-common#23