fix issues with Oracle backend

(from [2f2e53b4a6709b268a1d4744d7d5905dbee0f6ec]) Fix oracle test failures [#443 fix issues with Oracle backend]

Resolve oracle test error with 'possible nonthreadsafe access to
session' by flushing session

Fix NPE exceptions in tests by flushing save
https://github.com/dtolabs/rundeck/commit/2f2e53b4a6709b268a1d4744d...

(from [2e77b29a63472b61cdd81ff8f6d4ad509ad920c3]) Fix lock issue on oracle when aborting a job [#443 fix issues with Oracle backend] https://github.com/dtolabs/rundeck/commit/2e77b29a63472b61cdd81ff8f...

(from [b898188209fb6e7ad7522713228b71ec4db82d53]) Change ScheduledExecution.description constraints

[#443 fix issues with Oracle backend] https://github.com/dtolabs/rundeck/commit/b898188209fb6e7ad75227132...

(from [3c2117d1930c65c5a685a86a63792c0a53cfd43f]) Fix some api test issues with oracle [#443 fix issues with Oracle backend] https://github.com/dtolabs/rundeck/commit/3c2117d1930c65c5a685a86a6...

fixed an issue regarding aborting jobs with oracle

(from [cd122269537687076de51c948aa6e91098875040]) Fix upgrade issue with description null values

[#443 fix issues with Oracle backend] https://github.com/dtolabs/rundeck/commit/cd122269537687076de51c948...

(from [88ae9d6705e5b3cd2bd24324f396960ab22ef97c]) Change default configuration to rdbsupport=false

[#443 fix issues with Oracle backend] https://github.com/dtolabs/rundeck/commit/88ae9d6705e5b3cd2bd24324f...

(from [3bf94ab944c71eac7266d225861f4ffe98ec2840]) Fix job description null in views [#443 fix issues with Oracle backend] https://github.com/dtolabs/rundeck/commit/3bf94ab944c71eac7266d2258...