Allow WARNMSG to contain/start with '#'

Previosuly this error was being displayed:
	108: [: x#: unexpected operator


Together with the puppetlabs postgres module concatfragment failed because at [ x$WARNMSG ...]  where $WARNMSG started with an '#', which is invalid syntax.

This is the puppet agent output:

> debug: Exec[concat_/etc/postgresql/9.1/main/pg_hba.conf](provider=posix): Executing check '/var/lib/puppet/concat/bin/concatfragments.sh -o /var/lib/puppet/concat/_etc_postgresql_9.1_main_pg_hba.conf/fragments.concat.out -d /var/lib/puppet/concat/_etc_postgresql_9.1_main_pg_hba.conf -t -w '# This file is managed by Puppet. DO NOT EDIT.'  '
> debug: Executing '/var/lib/puppet/concat/bin/concatfragments.sh -o /var/lib/puppet/concat/_etc_postgresql_9.1_main_pg_hba.conf/fragments.concat.out -d /var/lib/puppet/concat/_etc_postgresql_9.1_main_pg_hba.conf -t -w '# This file is managed by Puppet. DO NOT EDIT.'  '
> debug: /Stage[main]/Postgresql::Config::Beforeservice/Postgresql::Pg_hba[main]/Concat[/etc/postgresql/9.1/main/pg_hba.conf]/Exec[concat_/etc/postgresql/9.1/main/pg_hba.conf]/unless: /var/lib/puppet/concat/bin/concatfragments.sh: 108: [: x#: unexpected operator