Change conflict resolution behavior of import_sshkey
Change conflict resolution behavior of import_sshkey

* Conflict resolution only active if the -a flag is given.
* The key name is used as the prefix for conflict-resolved names.
* Alternatively, a static prefix can be used instead of the
  key name.

ClemsonSoCUnix/django-sshkey,ClemsonSoCUnix/django-sshkey,ClemsonSoCUnix/django-sshkey