Fix 'only' constraint handling for schema_constraints.csv
Fix 'only' constraint handling for schema_constraints.csv

The goal of the 'only' is that only the explicitely mentioned tables are
to be created in the specified format. However there is currently a bug
in the parsing of the file that makes it so that only the _last_ table
is actually created. That is if there is a sequence of statements for a
certain format with the 'only' constraint only the last one is used.

This patch fixes this by making sure we actually create multiple tables
if we find them.

Change-Id: I28e91aeefc03dcca7de6ad4aa50456dcb90ed95c
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/6973
Reviewed-by: Martin Grund <2546548d516fa64c411fde8242af35f3f80ad31f@cloudera.com>
Tested-by: jenkins

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