Fix problem with review MySQL database charset

The review MySQL database is constantly flipping between the utf8
and latin1 charset.  It is also constantly flipping between the
latin1_swedish_ci collation and the utf8_general_ci collation.
The database was originally created using utf8 character set and
utf8_general_ci collation.  This fix will explicitly set the
character set and collation for the review server. This will stop
the constant flipping between charset and collation.

Change-Id: I0f8f769d6a629a774291e07a7b29f6653978cc8f
Closes-Bug: 1376926