Require libnl3-devel in wicked-devel

Signed-off-by: Olaf Hering <olaf@aepfle.de>
compat: no systemd check via mountpoint (bnc#864696)

Also removed obsolete NETWORKMANAGER variable check.
service: fix rpmlink suse-missing-rclink warnings
version 0.5.10
Merge pull request #174 from olafhering/olh-misc
version 0.5.11
Require libnl3-devel unconditional in wicked-devel in all dist versions

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Merge pull request #175 from olafhering/olh-misc

Require libnl3-devel unconditional in wicked-devel in all dist versions
version 0.5.12