fixed character-set detection regex

Previous regex matched COLLATE value instead of CHARACTER SET. For
example:

> CREATE DATABASE `test` /*!40100 DEFAULT CHARACTER SET utf8 COLLATE utf8_bin */

Returned utf8_bin instead of utf8 causing an unfortunate database refresh in my
configuration. Fixed the regex by adding the optional presence of the COLLATE
keyword.

Author: obilodeau

lib/puppet/provider/database/mysql.rb

@@ -22,7 +22,7 @@ def destroy
   end
 
   def charset
-    mysql("--defaults-file=#{Facter.value(:root_home)}/.my.cnf", '-NBe', "show create database `#{resource[:name]}`").match(/.*?(\S+)\s\*\//)[1]
+    mysql("--defaults-file=#{Facter.value(:root_home)}/.my.cnf", '-NBe', "show create database `#{resource[:name]}`").match(/.*?(\S+)\s(?:COLLATE.*)?\*\//)[1]
   end
 
   def charset=(value)