sriovdp_config: Improvements and fixes

sriovdp_config: Improvements and fixes

- do not fail sriovdp_config role if no PCI devices are matched by
  grep (e.g. for the old pattern, no PCI devices in PCI domain 0);
- allow network interface names that don't start with 'en', e.g. em1,
  p1p127;
- allow PCI devices on other domains than hardcoded '0000';
- Use full PCI address in /etc/pcidp/config.json for the newly allowed
  PCI domains (this is also supported, see [1], but for covenience they
  were left on default '0000');

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1770642

Change-Id: I117966a5530d4b1003154bf7cf8182986db112e8
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>