CLOUDIFY-1980
If plugin url contains ${plugin_repository} replace it with plugin repository url
Currently hard coded port of the embedded jetty file server of the management machine
CLOUDIFY-1981 do not filter riemann reload or celery restart in case of failure. and add stacktrace to error
Merge branch 'develop' into feature/CLOUDIFY-1980-dynamic-plugin-management-repository-url-injection

Conflicts:
	orchestrator/src/main/resources/celery/app/cosmo/cloudify/tosca/artifacts/plugin/plugin_installer/tasks.py
Change imports to new convention
GS-1960

Print task-failed event for everything but VERIFY_PLUGIN_TASK_NAME
GS-1980

Auto inject management embedded jetty url to plugin url
CLOUDIFY-1980

Replace hard coded plugin url pointing to management machine IP with injected plugin repository location
Reference vagrant readme
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Moved readme file to root folder
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