Removes log generation parameters from EXTRA_OPTS

Reasons:
- No need of using these parameters.
- Logging could be managed on its own by nova.
- Would help to reduce logfiles generation,
  hence making the maintenance easier.
- All other components are already doing this way.

Changes:
- Removed logdir from EXTRA_OPTS.
- Removed logfile_mode from EXTRA_OPTS.

If needed by user, one can modify the nova.conf to
generate logfiles at their desired location.

Change-Id: I301b8a2fa1522965442efa72e21085389ee662f8
Closes-Bug: #1260648
Merge "Removes log generation parameters from EXTRA_OPTS"
Fixes .gitignore

Reasons:
- There were multiple gitignore files in repository.

Changes:
- All files merged into single .gitignore.
- log files are now covered by *.log so no separate log names needed.

Change-Id: Ia7fb4d925669cf92ceed6706e770e66ea87f5b81
Closes-Bug: #1260461
Merge branch 'master' of https://github.com/openstack/trove-integration