Several improvements to LibraryTesting needed: network SQLDB and docker images to run the tests

[adrpo]

Tasks:

• Fix Optimize FMI testing #78
• Support network based SQL database (postgresql) to be able to distribute the jobs much better on several computers without the fear of overriding sqlite3 files. Currently we copy locally the sqlite3 file then run the testing, then push back the results. If two computers run the same job they will override each other depending on which one finishes first / last. We should have a way to signal in the database which library we are testing against which OMC version and do not run the same from another computer, just skip it.
• Use docker images for the Jenkins LibraryTesting so is easier to maintain