implement query.filter(pkg__neq=..) (RhBug: 1233770)
implement query.filter(pkg__neq=..) (RhBug: 1233770)

this was easy one :)

Closes: #94
Approved by: jsilhan

rpm-software-management/hawkey,rpm-software-management/hawkey,rpm-software-management/hawkey,rpm-software-management/hawkey