fabrics: Fix ordering for auto connect services

fabrics: Fix ordering for auto connect services

In order to be able to mount file systems via /etc/fstab we have to
make sure that the corresponding auto connect services have been
executed. Because the mounting of the local filesystem happens very
early in the boot we have to carefully sort these service file into the
boot process.

First, we have to disable the DefaultDependency as this will
automatically add dependency on sysinit.target which is too late (after
local mounts). Though without the default dependency we have to provide
a Before and After conditions.

The Before is simple as we have a local-fs-pre target. The After
is a bit tricky as there are no targets available.

Because the whole autoconnect machinery depends on udev events being
delivered we place the service after systemd-udevd has been started.

Link: https://www.freedesktop.org/software/systemd/man/bootup.html
Reported-by: Maurizio Lombardi <mlombard@redhat.com>
Reported-by: Wen Xiong <wenxiong@linux.ibm.com>
Tested-by: Maurizio Lombardi <mlombard@redhat.com>
Tested-by: Wen Xiong <wenxiong@linux.ibm.com>
Signed-off-by: Daniel Wagner <dwagner@suse.de>