singularity-2.3.1-2.1

- Removed:
  Do-chdir-before-duing-chroot.patch:
  After checking with the security team that there are no concerns
  about doing the chdir() after the chroot(), remove this patch and
  add a filter to keep rpmlint from complaining (bsc#1028304).

- set permissions for SUID binaries to 4750.
- fix library packaging for i586.
- add a README.SUSE
- temporarily filter filter for non-standard-gid from rpmlint
  until group 'singularity' is available as known group.

- Update to version 2.3.1:
  This release includes a fix for a High Severity security issue on older
  hosts, and other improvements and fixes to previous versions of Singularity.
  Version 2.3:
  There are a massive number of fixes, updates, optimizations and awesomeness
  contained within this release, but here is a brief overview of the major
  changes you can expect to find in this release:
    Lots of backend library changes to accommodate a more flexible API
    Restructured Python backend
    Updated bootstrap backend to make it much more reliable
    Direct support for the awesome, the fantastic, Singularity-Hub!
    Ability to run additional commands without root privileges (e.g. create,
    import, copy, export, etc..).
    Added ability to pull images from Singularity Hub and Docker
    Containers now have labels, and are inspect'able
- Do-chdir-before-duing-chroot.patch:
  Add a chdir() before chroot() just to keep rpmlint from complaining
  even more. There is a chdir("/") right after the chroot() call.
- Created group 'singularity' and make suid-root binaries only executable
  by this group.

- Initial import of singuarity 2.2.1.