utils: add init_cache function

init_cache() creates the default directory in which OpenGnsys stores
images when using any cache enabled transfer method.

As of this commit this folder must exist for tiptorrent.py to
work properly.

Subprocess Popen object inside tiptorrent.py use
'cwd' optional parameter like:

	cwd='/opt/opengnsys/cache/opt/opengnsys/images/'

This folder convention might change in the future.

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