[director] Use new Resque logging and signaling properties [fixes #48285613]

- Change deprecated VERBOSE and VVERBOSE logging properties with new Resque Logger
- Use Resque new signal handling path (see http://hone.heroku.com/resque/2012/08/21/resque-signals.html)
[release] Delete utility job [fixes #48217295]
[director] Let max_in_flight be more than 32 [fixes #47570943]
Replace archive-tar-minitar gem with newer minitar gem [fixes #48713695]
[cli] Better error message on shh when authentication failed [fixes #49676225]

Also improved some unit tests.
Merge pull request #207 from cloudfoundry/minitar

Replace archive-tar-minitar gem with newer minitar gem [fixes #48713695]
Merge pull request #204 from cloudfoundry/resque_logging

[director] Use new Resque logging and signaling properties [fixes #48285613]
Merge pull request #205 from cloudfoundry/delete_utillity_job

[release] Delete utility job [fixes #48217295]
Merge pull request #206 from cloudfoundry/max_in_flight

[director] Let max_in_flight be more than 32 [fixes #47570943]
Merge pull request #208 from cloudfoundry/cli_ssh

[cli] Better error message on shh when authentication failed [fixes #49676225]
[cli] fix 'dirty_state?' to work with git older than 1.8