Python: Add thrift_sasl to virtualenv
Python: Add thrift_sasl to virtualenv

Previously thrift_sasl was brought into the virtualenv by building
the shell. That meant the shell had to be built before the
virtualenv could be used. By includeing thrift_sasl directly, the
virtualenv can be used even if impala/shell is not built.

Change-Id: Id1a099036b1ac8add5a314af981789ebf69ce465
Reviewed-on: http://gerrit.cloudera.org:8080/685
Reviewed-by: Casey Ching <77bc9a9984e6786c5799d7a71768cf023120ef76@cloudera.com>
Tested-by: Internal Jenkins

cloudera/Impala,cloudera/Impala,cloudera/Impala,michaelhkw/incubator-impala,cloudera/Impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,cloudera/Impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,cloudera/Impala,cloudera/Impala