CFY-1854 wait for transactions to end before starting VM.
CFY-1854 flake8.
CFY-1854 flake8.
CFY-1854 added retry-interval to operations inputs.
CFY-1854 flake8
Merge pull request #38 from cloudify-cosmo/CFY-1854-start-operation

CFY-1854 wait for transactions to end before starting VM.