Merge branch 'es/trace2-log-parent-process-name'

trace2 logs learned to show parent process name to see in what
context Git was invoked.

* es/trace2-log-parent-process-name:
  tr2: log parent process name
  tr2: make process info collection platform-generic

diff --cc Documentation/technical/api-trace2.txt
Simple merge

diff --cc Makefile
Simple merge

diff --cc config.mak.uname
Simple merge