pactest: check for pacman binary before running

Using fakeroot or fakechroot as the command with subprocess.call
prevents the detection and reporting of a missing pacman binary.  Some
tests even pass when run with a non-existent binary.  Checking manually
allows us to provide a meaningful error message and prevent the false
positives.

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>

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