Include additional cwl requirements

[ChaamC]

• Support CWL definition for cwltool:CUDARequirement to request the use of a GPU, including support for using Docker with a GPU.
• Support CWL definition for NetworkAccess to indicate whether a process requires outgoing IPv4/IPv6 network access.

Fixes #104

[codecov[bot]]

Codecov Report

Merging #494 (3bd76e1) into master (ea77e5c) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #494      +/-   ##
==========================================
+ Coverage   83.57%   83.60%   +0.03%     
==========================================
  Files          77       77              
  Lines       15614    15631      +17     
  Branches     2377     2377              
==========================================
+ Hits        13049    13068      +19     
+ Misses       1895     1894       -1     
+ Partials      670      669       -1     

Impacted Files	Coverage Δ
weaver/processes/constants.py	100.00% <100.00%> (ø)
weaver/wps_restapi/swagger_definitions.py	99.92% <100.00%> (+<0.01%)	:arrow_up:
weaver/wps_restapi/colander_extras.py	81.55% <0.00%> (+0.20%)	:arrow_up:

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