Expand to longtext column type for rules in mysql.

Ran out of space in text.
Merge branch 'master' into dgoodwin/mysql-rules-column

Conflicts:
	src/main/resources/db/changelog/changelog-create.xml
	src/main/resources/db/changelog/changelog-update.xml
Merge pull request #500 from candlepin/dgoodwin/mysql-rules-column

Expand to longtext column type for rules in mysql.