(#76) Open connection with pre configured session

[robinmatz]

Give the user the ability to open a connection using a session file. Session files are an alternative way to set up a connection using x3270 resources.

The new Open Connection From Session File is meant to be an alternative for Open Connection.

[codecov-commenter]

Codecov Report

Patch coverage: 93.93% and project coverage change: -0.04 ⚠️

Comparison is base (10c4d31) 94.32% compared to head (a629b3e) 94.28%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #90      +/-   ##
==========================================
- Coverage   94.32%   94.28%   -0.04%     
==========================================
  Files           4        4              
  Lines         581      612      +31     
  Branches       90       98       +8     
==========================================
+ Hits          548      577      +29     
- Misses         28       29       +1     
- Partials        5        6       +1     

Flag	Coverage Δ
acceptance	79.57% <66.66%> (-0.46%)	⬇️
unit	86.92% <66.66%> (-1.20%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Mainframe3270/x3270.py	99.08% <93.75%> (-0.58%)	⬇️
Mainframe3270/__init__.py	100.00% <100.00%> (ø)

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[robinmatz]

I needed to change this name in order to mock the os_name in the unit tests. Since the only interface to the user is the Mainframe3270 class, I do not consider this to be a breaking change.