legacy: improve readability of ogGetImageInfo helper functions

Change the name of the helper functions used when getting opengnsys
image information (legacy ogGetImageInfo bash script). As of now the
process consist of decompressing the image file with lzop and feeding
that output to partclone.info.

Prefer a more explicit function name rather than "process_image_*"

Add comment about skipping the first two lines of partclone.info output.
Usually, partclone.info starts printing out these two lines that are not
related to the partclone image information:

	Partclone v0.3.23 http://partclone.org
	Showing info of image (-)

As long as partclone.info output doesn't change we'll be fine, but we
should not depend on human readable output. This might change in the
future (i.e. adding json output format to partclone.info).

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