Handle spaceless args like '-k32', not just '-k 32'

[jkbecker]

Redid #59 based on the development branch, and improved implementation based on @altendky's feedback.
Fixes #41.

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This breaks up known chia plot create arguments when they don't contain a space character between key and value, to prevent faulty arg handling by the Job class.

Example:

>>> cmdline = ['/chia-blockchain/venv/bin/python3.8', 'venv/bin/chia', 'plots', 'create', '-n1', '-k32', '-r12', '-t/plots/tmp', 
'-2/plots/tmp', '-d/plots', '-b9216']

This would usually result in faulty parsing and a StopIteration exception in job.py line 105:

Warning: unrecognized args: -k32 -r
Warning: unrecognized args: 12 -t
Warning: unrecognized args: /plots/tmp -2
Warning: unrecognized args: /plots/tmp -d
Warning: unrecognized args: /plots -b

i.e. completely mismatched argument keys/values.
Solution:

>>> cmdline_argfix(cmdline)
['/chia-blockchain/venv/bin/python3.8', 'venv/bin/chia', 'plots', 'create', '-n', '1', '-k', '32', '-r', '12', '-t', '/plots/tmp', '-2', '/plots/tmp', '-d', '/plots', '-b', '9216']

[altendky]

Thanks for the fix. Already have someone else dealing with this too.