Merge pull request #10012 from vjpai/phpqps

src/php/tests/qps/client.php

src/php/tests/qps/composer.json

...rated_code/GPBMetadata/Src/Proto/Grpc/Testing/Control.php

...ated_code/GPBMetadata/Src/Proto/Grpc/Testing/Messages.php

...ated_code/GPBMetadata/Src/Proto/Grpc/Testing/Payloads.php

..._code/GPBMetadata/Src/Proto/Grpc/Testing/ProxyService.php

...ated_code/GPBMetadata/Src/Proto/Grpc/Testing/Services.php

...nerated_code/GPBMetadata/Src/Proto/Grpc/Testing/Stats.php

...ps/generated_code/Grpc/Testing/BenchmarkServiceClient.php

src/php/tests/qps/generated_code/Grpc/Testing/BoolValue.php

...ests/qps/generated_code/Grpc/Testing/ByteBufferParams.php

src/php/tests/qps/generated_code/Grpc/Testing/ChannelArg.php

src/php/tests/qps/generated_code/Grpc/Testing/ClientArgs.php

...hp/tests/qps/generated_code/Grpc/Testing/ClientConfig.php

...php/tests/qps/generated_code/Grpc/Testing/ClientStats.php

...hp/tests/qps/generated_code/Grpc/Testing/ClientStatus.php

src/php/tests/qps/generated_code/Grpc/Testing/ClientType.php

...ests/qps/generated_code/Grpc/Testing/ClosedLoopParams.php

...ts/qps/generated_code/Grpc/Testing/ComplexProtoParams.php

...php/tests/qps/generated_code/Grpc/Testing/CoreRequest.php