tolerate if some key types can't be created (LP: #1936473)
For example in FIPS mode we otherwise abort with
DSA keys are not allowed in FIPS mode^M
Traceback (most recent call last):
File "/usr/bin/uvt-kvm", line 35, in <module>
uvtool.libvirt.kvm.main_cli_wrapper(sys.argv[1:])
File "/usr/lib/python2.7/dist-packages/uvtool/libvirt/kvm.py", line 861, in main_cli_wrapper
main(*args, **kwargs)
File "/usr/lib/python2.7/dist-packages/uvtool/libvirt/kvm.py", line 856, in main
args.func(parser, args)
File "/usr/lib/python2.7/dist-packages/uvtool/libvirt/kvm.py", line 643, in main_create
ssh_host_keys, ssh_known_hosts = uvtool.ssh.generate_ssh_host_keys()
File "/usr/lib/python2.7/dist-packages/uvtool/ssh.py", line 50, in generate_ssh_host_keys
_keygen(key_type, private_path)
File "/usr/lib/python2.7/dist-packages/uvtool/ssh.py", line 34, in _keygen
'-C', 'root@localhost'
File "/usr/lib/python2.7/subprocess.py", line 190, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['ssh-keygen', '-q', '-f', '/tmp/uvt-kvm.sshtmpVhmPlF/dsa', '-N', '', '-t', 'dsa', '-C', 'root@localhost']' returned non-zero exit status 255
Signed-off-by: Christian Ehrhardt <email address hidden>