Merge lp://staging/~brad-marshall/charms/trusty/rabbitmq-server/add-nrpe-checks into lp://staging/charms/trusty/rabbitmq-server

UOSCI bot says:
charm_unit_test #828 trusty-rabbitmq-server for brad-marshall mp241485
    UNIT FAIL: unit-test failed

UNIT Results (max last 5 lines):
  raise child_exception
  OSError: [Errno 2] No such file or directory
  Ran 1 test in 0.148s
  FAILED (errors=1)
  make: *** [test] Error 1

Full unit test output: http://paste.ubuntu.com/8955759/
Build: http://10.98.191.181:8080/job/charm_unit_test/828/

UOSCI bot says:
charm_lint_check #993 trusty-rabbitmq-server for brad-marshall mp241485
    LINT OK: passed

LINT Results (max last 5 lines):
  I: config.yaml: option vip has no default value
  I: config.yaml: option key has no default value
  I: config.yaml: option ssl_cert has no default value
  I: config.yaml: option ssl_ca has no default value
  I: config.yaml: option source has no default value

Full lint test output: http://paste.ubuntu.com/8955760/
Build: http://10.98.191.181:8080/job/charm_lint_check/993/

UOSCI bot says:
charm_amulet_test #373 trusty-rabbitmq-server for brad-marshall mp241485
    AMULET FAIL: amulet-test missing

AMULET Results (max last 5 lines):
INFO:root:Workspace dir: /var/lib/jenkins/workspace/charm_amulet_test
INFO:root:Reading file: Makefile
INFO:root:Searching for: ['@juju test']
INFO:root:Search string not found in makefile target commands.
ERROR:root:No make target was executed.

Full amulet test output: http://paste.ubuntu.com/8955880/
Build: http://10.98.191.181:8080/job/charm_amulet_test/373/