Add MySQL regression tests
Merge remote-tracking branch 'upstream/master' into mysql-postgres-regr-tests
Get MySQL regression tests working

1. Dump the existing database before doing a new test installation
   as not doing so changes the dump.
2. Use --skip-comments when conducting the mysqldump to avoid time
   and system specific information in the dump file.
3. Add checksum.

This is currently missing a multi-table database due to waiting
on #93.
Only drop the test database if it exists
Remove more metadata from dump file using --compact

Hope that this gets rid of the remaining system specific
information that is causing the CI builds to fail.
Remove more potentially system specific information from mysql dumps

Trying to make the dumps system agnostic for testing purposes.
Further attempts to make MySQL dumpfiles consistent across systems

1. Strip out create statements
2. Use mysqldump's --result-file instead of >
Merge pull request #129 from ethanwhite/mysql-regr-tests

MySQL regression tests