Oncat connectivity status +configuration mechanism

[mpatrou]

Short description of the changes:

related PR: neutrons/pyoncatqt#9
oncat connectivity status logic update, configuration mechanism and client id

Long description of the changes:

The code includes the following:

• oncat connectivity status appears only for 5 seconds
• ocan login dialog pops up at button pressing at any time
• client id update
• configuration mechanism with inclusion of version. Version is retrieved from _version_ and written to the user's configuration file. If user's version does not exist or different that current software version all configruation variables are updated, else it works as before.
• tests updated/new for the logic
• refine ub update with group attribute, due to Mantid changes

Check list for the pull request

• I have read the [CONTRIBUTING]
• I have read the [CODE_OF_CONDUCT]
• I have added tests for my changes
• I have updated the documentation accordingly

Check list for the reviewer

• I have read the [CONTRIBUTING]
• I have verified the proposed changes
• best software practices
  • all internal functions have an underbar, as is python standard
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

Manual test for the reviewer

References

[SHIVER] OnCat -  Connection Status functionality update

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.33%. Comparing base (f490bdd) to head (6edcab3).
Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #146      +/-   ##
==========================================
+ Coverage   82.29%   82.33%   +0.03%     
==========================================
  Files          39       39              
  Lines        6195     6209      +14     
==========================================
+ Hits         5098     5112      +14     
  Misses       1097     1097              

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