[Assembly] Make mysql connector available to database creation script

This resolves nasa/mct#221 by modifying build script and database creation script such that mysql connector is available for database initialization task. (This connector had previously been moved in support of nasa/mct#109)

     Wrote or re-wrote unit tests (Y/N): N
     Ran entire suite of unit tests successfully (Y/N): Y
     Verified bug fix with the described replication steps or verified the implementation meets the requirement cited (Y/N): Y
     Code coverage requirements satisfied (new code=80%, changed code=at least as high as existing) (Y/N): N/A
     Code review date and attendees: Self-review by pull request
     Describe potential impact on other areas of the code: Database creation
     Describe any test prerequisites for this fix (e.g., restart the database): Start MySQL
     For bugs marked "Regression - Yes", describe the cause of the regression: Caused by configuration changes in support of nasa/mct#109, which were pulled in nasa/mct#143. These moved required jars in order to permit running MCT without extra arguments, but failed to account for the fact that these jars were also used by the build script.
     Did you modify any pom.xml file? If yes, did you thoroughly document your changes and reasons? Y (dist.xml modified; reasons documented in corresponding commits)

Unit tests are inapplicable (changes are to build scripts)