Fix /prod -> /proc for processInfo

[FengyunPan2]

fix the processName of processInfo always null.

[FengyunPan2]

@florianl For Java processes, the value from /proc//comm is simply "java", which is too generic to distinguish between different Java applications. Can we enhance this by incorporating the information from /proc//cmdline?

[florianl]

@FengyunPan2 there are multiple options to distinguish different Java processes:

• Whitelist environment variables: This will extract and enrich profiling information with environment variables information. As often makes use of environment variables, this could help.
• Use container ID or host information: Often environment are separated in some way. Being environment aware could help.
• ProcessMeta.Executable: While /proc/<PID>/comm sounds less useful, the value from /proc/<PID>/exe will be available via ProcessMeta.Executable and could help.