Merge pull request #1649 from pentaho-nbaker/5.1

[BISERVER-11770] Shutting-down existing scheduler properly so it's not o...
[PDI-12451] Remove interbase driver dep
Merge pull request #1650 from lmgrill/5.1

[PDI-12451] Remove interbase driver dep
[PPP-3283] DynamicallyPooledDatasourceSystemListener is creating bad DataSource objects for JNDI connections