Query.Language: Support "!="
Query.Language: Support "!="

It is specified in `man 7 ganeti`.

Ideally we would drop support for it and keep only "not (==)",
but Ganeti 2.10 supported "!=", so we keep it as supported legacy.

This only affects parsing "!="; the internal representation is "not (==)".

Signed-off-by: Niklas Hambuechen <98215d3a72cb13cc9c9956528e50119ca7d1fb8b@google.com>
Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>

bitemyapp/ganeti,leshchevds/ganeti,yiannist/ganeti,yiannist/ganeti,andir/ganeti,ganeti/ganeti,apyrgio/ganeti,onponomarev/ganeti,onponomarev/ganeti,ganeti-github-testing/ganeti-test-1,bitemyapp/ganeti,ganeti-github-testing/ganeti-test-1,yiannist/ganeti,ganeti/ganeti,dimara/ganeti,leshchevds/ganeti,leshchevds/ganeti,andir/ganeti,apyrgio/ganeti,dimara/ganeti,andir/ganeti,ganeti/ganeti,mbakke/ganeti,mbakke/ganeti,grnet/snf-ganeti,mbakke/ganeti,grnet/snf-ganeti