XbpsRequirement.py: Add subclass for xbps

Closes coala/package_manager#202
11 jobs for xbps in 31 minutes and 4 seconds
latest
Status Job ID Name Coverage
  Test
passed #89199959
check_code

00:02:22

passed #89199956
test:arch

00:12:06

passed #89251285
test:fedora_25_py35

00:15:41

passed #89199953
test:fedora_28_py37

00:15:13

failed #89391018
freebsd
test:freebsd_release

passed #89199955
test:opensuse_leap

00:15:22

passed #89199951
test:ubuntu_rolling

00:13:05

failed #89199952
test:fedora_25_py35

00:12:38

failed #89199958
freebsd
test:freebsd_release

failed #89251307
freebsd
test:freebsd_release

failed #89251423
freebsd
test:freebsd_release

 
Name Stage Failure
failed
test:freebsd_release Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
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