Add new pkg repo file hash ability to poudriere.conf Default to off

[darkfiberiru]

@allanjude Here's an initial addition to poudriere. Do you think it makes sense to expose both hash and symlink ability or just default to creating symlink if your appending hash to package name

If anyone has a prefered method to a poudriere.conf variable Please let me know

@allanjude Also any help on wording for poudriere.conf comment would be appreciated

[swills]

Is it me or is there a mix-up between $PKG_OPTIONS and $REPO_OPTIONS here? Looks like $PKG_OPTIONS is set and not used and $REPO_OPTIONS is used but not set.

[darkfiberiru]

@swills Thank you indecisiveness striked on variable naming and I didn't proofread well enough. Fixed now along with improvements to pourdriere.conf option comment. @dch Thanks for input. Does the new wording read any better.

[darkfiberiru]

#751 Apparently this is a duplicate as I didn't search prior june when the pkg hash work was redone and allan had submitted a PR in april