logcat: posixize and extend long arguments

- change _ to - for long arguments
- added --tail as hidden undocumented alias for -t
- added --head as hidden undocumented alias for --max-count

Bug: 27706081
Change-Id: I614cc83ae56b305b267f64ed05dc3ed3027dabd4
1 file changed
tree: d4ec6fcb5d53da4409612fb8a86764d96ede580e
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/