Perform the code changes that we discuss in this code review.

Removed obsolete build settings
* removed explicite disabeling parallel
* removed logLevel := Level.Warn

Removed jdbc connection test from MigrationSeqTest. They should be placed somewhere
else but as say it is out of scope for this PR.

Could be ride of problem with mysql create database in the
databases.properties file that was somehow not performed before.
After this fix i delete the create database commands for postgres and mysql from
the .travis.yml build file.