CLOUDIFY-1904 wait for plugin before task execution.
CLOUDIFY-1904 wait for plugin before task execution.
CLOUDIFY-1904 install plugin_installer in management worker and assign celery workers with hostnames.
CLOUDIFY-1904 fixed test.
Merge branch 'develop' into feature/CLOUDIFY-1904-riemann-monitoring

Conflicts:
	orchestrator/src/test/java/org/cloudifysource/cosmo/orchestrator/workflow/RuoteExecutePlanTest.java
CLOUDIFY-1904 console stream in riemann configuration.
Merge pull request #27 from CloudifySource/feature/CLOUDIFY-1904-riemann-monitoring

CLOUDIFY-1904 verify plugin existence before task execution