Make abuild -F snapshot work

Closed Wictor Lund requested to merge wictory/abuild:fix_recursive_calls into master

Inside snapshot() there are two recursive call to abuild. These calls are done as abuild clean and abuild checksum. This makes it impossible to run abuild -F snapshot as root. I propose that these calls are changed to "$abuild_path" $forceroot clean and "$abuild_path" $forceroot checksum.

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