Install crowbar-openstack before neutron

neutron installation fails because it depends on crowbar-openstack cookbook.
The error message is:

    Installing barclamp neutron from /opt/dell/barclamps/neutron
    ERROR: /opt/dell/barclamps/neutron knife cookbook upload -o . neutron -V -k /etc/chef/webui.pem -u chef-webui upload failed.  Aborting; examine /var/log/crowbar/barclamp_install/neutron.log for more info.

And neutron.log content is:

    Uploading neutron        [1.0.0]
    ERROR: Cookbook neutron depends on cookbook crowbar-openstack version >= 0.0.0,
    ERROR: which is not currently being uploaded and cannot be found on the server.

**This commit is forward-ported from 6c8cf21ff4cd54265ed7bdba1fb81b56c8679da2**
Relax SLES media check

* Fixed tftpboot symlink check
* Also accept the SUSE Cloud Deps media instead of SLES media

**This commit is back-ported from d782e7adf35224ae11019e020817114efd80892b, dd2d23f5b6986f12616890185820a1f3fcb2ac5c and 28313f08d65cd50be37312cb85d3ac58c176a9c2**