Add table to mysql_grant call

When using puppetlabs-mysql 2.2 with the ceilometer module, an
error occurs due to a call to mysql_grant not specifying a table.
This patch corrects the error by rectifying the mysql_grant call.

Change-Id: I0619446907c5fb51dcdb6e5717faeb61442c699b
Closes-Bug: #1308884