[CDH4] IMPALA-982: Remove unresolved parent in cdh4-extras pom.xml

Change-Id: I0ec16eb9fe300f5896f31c741cb6b959816fd7de
Reviewed-on: http://gerrit.ent.cloudera.com:8080/2463
Reviewed-by: Matthew Jacobs <mj@cloudera.com>
Tested-by: jenkins