Enable nightly tests on cm5.1 distro machines

The cm5.1 machines are Cloudera CDH 5.1, but are managed with
Cloudera Manager tool. Trafodion instances are installed/started
using trafodion installer tool, rather than started in the build tree.

When the nightly tests run well, then more cm5.1 nodes will be brought up
to replace all the cdh5.1 nodes in all pipelines.

Change-Id: I6dbcd3cec0e6982135ddb6a5ca34d88912320ee3