Fix bugzilla detection behind proxy

Python requests handles proxying, use it also during bugzilla detection
phase. Don't bother with cookies at this point.
tests: Fix some bits that depend on changed bz state
HACKING: Fix a typo
bugzilla-cli: Make it actually use cwd bugzilla module
tox.ini: Manually list requirements

Fedora 20 tox version isn't new enough for that syntax
contrib: Drop run-tests

We have tox to handle this for us
.gitignore: Ignore .tox directory
HACKING: Minor tweaks
Fix messages from pylint 1.1
bugzilla: Fix --nosslverify
rhbugzilla: Request sub_components field
bin/bugzilla: Add query --quicksearch

Only supported on bugzilla.redhat.com
bin/bugzilla: Add query --savedsearch support
bin/bugzilla: Support savedsearches via --from-url
spec: Add python3 packaging
Update COPYING
bin/bugzilla: Support 'modify --sub-component'
bin/bugzilla: Add 'create --sub-component'
bin/bugzilla: Add query --sub-component
Some fixes to work with RHEL6 python2.6