Add option to build UDF test libs in copy-udfs-udas.sh
Add option to build UDF test libs in copy-udfs-udas.sh

The option is off by default, but useful for running this script
without building the world.

Change-Id: I82d8251cf9bb2763ce69094da1995a4d6ceff167
Reviewed-on: http://gerrit.ent.cloudera.com:8080/2647
Reviewed-by: Nong Li <99a5e5f8f5911755b88e0b536d46aafa102bed41@cloudera.com>
Tested-by: jenkins
(cherry picked from commit a7f77643820dcbfbab231a9260c94450564bd2df)
Reviewed-on: http://gerrit.ent.cloudera.com:8080/2659
Reviewed-by: Skye Wanderman-Milne <6d4b168ab637b0a20cc9dbf96abb2537f372f946@cloudera.com>

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