Add ^ when matching mysql output

Since Ubuntu 16.04 LTS requires that MySQL type detection works, due to
changes in MySQL 5.7, change the regular expression checked against
mysqld -V output to also match ^mysql.

Author: s-t-e-v-e-n-k

lib/puppet/provider/mysql.rb

@@ -22,7 +22,7 @@ def self.defaults_file
   def self.mysqld_type
     # find the mysql "dialect" like mariadb / mysql etc.
     mysqld_version_string.scan(/mariadb/i) { return "mariadb" }
-    mysqld_version_string.scan(/\s\(mysql/i) { return "mysql" }
+    mysqld_version_string.scan(/(\s\(|^)mysql/i) { return "mysql" }
     mysqld_version_string.scan(/\s\(percona/i) { return "percona" }
     return "mysql"
   end