Update python impala cluster script for docker compatibility
Update python impala cluster script for docker compatibility

The python scripts looked at all processes even those not owned by the
current user which includes docker processes. The fix is to only
consider processes owned by the current user.

Some unused imports were also removed.

Change-Id: I8ae7c4a5f3c6ce7d2838f9f722d5341c585cf562
Reviewed-on: http://gerrit.cloudera.org:8080/1629
Reviewed-by: Casey Ching <77bc9a9984e6786c5799d7a71768cf023120ef76@cloudera.com>
Tested-by: Internal Jenkins

kapilrastogi/Impala,kapilrastogi/Impala,kapilrastogi/Impala,kapilrastogi/Impala,kapilrastogi/Impala,kapilrastogi/Impala,kapilrastogi/Impala