Add Impala repos for package installation
Merge pull request #21 from abayer/master

Add Impala repos for package installation
Bump up timeout waiting for CM server to come up
Merge pull request #23 from abayer/master

Bumping up timeout waiting for CM server to come up
LoadingCache-ify CmServerClusterInstance's cluster variable
Merge pull request #24 from abayer/master

Use LoadingCache for isolation of CmServerClusterInstance.cluster