* improve grpc UT

Fix parsing of /proc/PID/statm and removed process_memory_library/dirty which are always 0 since linux 2.6

H2 docs

Add h2/grpc docs

fix compiling error on macos caused by 'DVLOG_IF'

Grpc support

Replace InternalReset/DeleteStuff with ResetPods/NonPods & Save protocol-param in thrift_method_name which is rarely used

fix read_invariant_cpu_frequency