Updated to check LabOne revision to select which nodes to write

[nielshaandbaek]

This MR updates the HDAWG PycQED driver to check the LabOne revision in order to determine which node to write to enable the QuSurf DIO mode. The update makes the PycQED driver compatible with LabOne 20.08.

Fixes #183.

Changes proposed in this pull request:

• Added LabOne version check when configuring QuSurf DIO mode in ZI_HDAWG8
• Improved readability of node creation in MockDAQServer class
• Added more nodes to MockDAQServer class related to DIO for both UHFQA and HDAWG8

@MiguelSMoreira

In order for the pull request to be merged, the following conditions must be met:

• travis test suite passes
• all reasonable issues raised by codacy must be resolved
• a positive review is required

Whenever possible the pull request should

• follow the PEP8 style guide
• have tests for the code
• be well documented and contain comments

Tests are not mandatory as this is generally hard to make for instruments that interact with hardware.

[codecov-commenter]

Codecov Report

Merging #636 into develop will increase coverage by 0.00%. The diff coverage is 91.17%.

@@           Coverage Diff            @@
##           develop     #636   +/-   ##
========================================
  Coverage    36.41%   36.42%           
========================================
  Files          351      351           
  Lines        75643    75656   +13     
========================================
+ Hits         27545    27556   +11     
- Misses       48098    48100    +2     

Impacted Files	Coverage Δ
...hysical_instruments/ZurichInstruments/ZI_HDAWG8.py	31.08% <40.00%> (+0.02%)	:arrow_up:
...nstruments/ZurichInstruments/ZI_base_instrument.py	77.04% <100.00%> (+0.30%)	:arrow_up:

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