CFY-1799 added queue deletion to win agent installer; few minor fixes to linux agent installer as well
CFY-1799 added error handling for queue deletion in worker installers
Merge pull request #181 from cloudify-cosmo/CFY-1799-remove-rabbitmq-queues-before-worker-installation-in-win-agent-installer

CFY 1799 remove rabbitmq queues before worker installation in win agent installer