App runtime should print OSS version

[vijaynalawade]

Since app is built against particular OSS version, we should log OSS version when app is started.

[mellistibco]

We'd want to print the version of the lib & the action(s) that the bin was built against, as we could have a version difference between contrib and lib

[retgits]

Running a Flogo app with the logging set to debug already tells you what the versions of the activities are that are used in the app. A sample is below:

2018-05-30 20:21:42.799 DEBUG  [flogo] - Registering activity [ github.com/TIBCOSoftware/flogo-contrib/activity/log ] which has version [ 0.0.1 ]
2018-05-30 20:21:42.799 DEBUG  [flogo] - Registering activity [ github.com/TIBCOSoftware/flogo-contrib/activity/actreply ] which has version [ 0.0.1 ]
2018-05-30 20:21:42.799 DEBUG  [engine] - Starting app [ slackapp ] with version [ 0.0.1 ]