Gatling performance tests instructions

[danilomendonca]

Steps to reproduce the issue:

1. run any of the performance tests with gatling following the instructions under tests/performance

• e.g., [variables] ./gradlew gatlingRun-LatencySimulation

Provide the expected results and outputs:

normal execution of the performance test

Provide the actual results and outputs:

Exception in thread "main" java.lang.IllegalArgumentException: The requested class 'LatencySimulation' can not be found in the classpath or does not extends Simulation.

Fix

update the performance tests README.md; at each test run example, the complete path to the test class should be included:

- ./gradlew gatlingRun-org.apache.openwhisk.ApiV1Simulation
- ./gradlew gatlingRun-org.apache.openwhisk.LatencySimulation
- ./gradlew gatlingRun-org.apache.openwhisk.BlockingInvokeOneActionSimulation

[chetanmeh]

@danilomendonca Thanks for the reporting it. This is most likely due to recent change in package names #4073. Would you be able to create a PR to update the docs?

[danilomendonca]

@chetanmeh done :)

Cheers
Danilo