allow tests for disabled features to be skipped

Previously, pacman's test suite would fail when compiled without
signature support.

Adds a require_capability method to pmtest objects.  Currently
recognized values are 'gpg', 'curl', and 'nls'; although only gpg is
used presently.  Missing features are indicated by running pactest with
one of the --without-<feature> options.

This modifies pmenv to run each case as independent tests.  Previously,
a single pmenv could run multiple tests, combining there output into
a single TAP stream but making it impossible to properly skip an entire
test case.  This change does not affect running pactest.py with a single
test (as both autotools and meson do), but will affect anybody manually
running pactest.py with multiple tests at once.

Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

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