Bug 1038933 - Add option to retrieve kgsl memory reports in get_about_memory.py. r=njn

- Adds a '--no-kgsl-logs' option to disable collection
- Retrieves all entries under /d/kgsl/proc/<pid>/mem
- Attempts to associate mem files with a proper process name
Merge pull request #367 from EricRahm/bug_1038933

Bug 1038933 - Add option to retrieve kgsl memory reports in get_about_memory.py