Initializing the impala-python virtualenv takes a couple minutes,
so it is useful to do that in parallel to the rest of the build.
This moves the impala-python initialization to its own step
in the CMake build. It stops using impala-python for commands
invoked from buildall.sh or the CMake build to avoid premature
or concurrent initializations of impala-python. Then, it adds
a dedicated step to initialize impala-python.
Testing:
- Ran a core job and a couple builds
- Rebuilt and verified that impala-python is not reinitialized
if it is already initialized
Change-Id: Ieff51263c55bd234028fed7101c94b4a928590f0
Reviewed-on: http://gerrit.cloudera.org:8080/16607
Reviewed-by: Tim Armstrong <tarmstrong@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
