Radical.entk

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- replace RMQ communication with ZMQ
- add attribute `exclusive` to `Task.tags` (in sync with RP tags representation)
- add scaling examples
- comment some debug logs, always set exception attribs
- fix Mock backend
- inform RE about RP level task errors

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- bump python test env to 3.7
- doc updates
- synced with updated attributes in RP TaskDescription

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- added task attribute `environment`

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- added timeout for online version check

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- add tutorial examples
- cleanup gitignore
- deleted test related to ticket 255 - are already tested
- deleted test related to ticket 270 - `heartbeat` test updated accordingly
- introduced Task attributes `pre/post_launch`
- move tutorial code to notebooks
- removed leftovers in `test_issues` - all covered with other tests
- set pilot cancellation through session close
- updated `heartbeat_response` for TMGR

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- fix lingering uid error
- update AppManager instance check in `prof_utils`
- updated setup requirements