Bug 1377258

Description of problem:
SSIA. Happened to me because I mistyped the CDS hostname using a non-English keyboard layout.

Version-Release number of selected component (if applicable):
rh-rhui-tools-pre.3.0.21-1.el7ui.noarch

How reproducible:
Always

Steps to Reproduce:
1. Run rhui-manager. Authenticate if necessary.
2. Enter 'c' to go to the CDS settings. (Or 'l' for LB settings.)
3. Enter 'a' to launch the new CDS wizard.
4. Enter a hostname that doesn't resolve. I used 'cdsé02.example.com' by mistake and didn't notice the warning I got immediately.
5. Also enter a (valid) username and path to your SSH private key, as usual.

Actual results:
Failure. rhui-manager stops running and I'm back in the shell. Scrollback buffer:

======
Hostname of the CDS instance to register:
cds02.example.com
======
^ Here the hostname looks correct, but that's only because the backspace key I used to get rid of the erroneously entered é didn't really delete that character from the prompt.

======
/usr/lib/python2.7/site-packages/rhui/tools/screens/instances.py:156: UnicodeWarning: Unicode equal comparison failed to convert both arguments to Unicode - interpreting them as being unequal
  if hostname in [instance[constants.INSTANCE_HOSTNAME_KEY] for instance in instance_config]:
Username with SSH access to cdsé02.example.com and sudo privileges:
ec2-user

Absolute path to an SSH private key to log into cdsé02.example.com as ec2-user:
/root/.ssh/id_rsa_rhua

/usr/lib/python2.7/site-packages/rhui/tools/screens/instances.py:209: UnicodeWarning: Unicode equal comparison failed to convert both arguments to Unicode - interpreting them as being unequal
  if hostname in [instance[constants.INSTANCE_HOSTNAME_KEY] for instance in instance_config]:

Checking that instance ports are reachable...
[localhost] local: yum install -y nc
[localhost] local: nc cdsé02.example.com 22 < /dev/null

Fatal error: local() encountered an error (return code 2) while executing 'nc cdsé02.example.com 22 < /dev/null'

Aborting.
[root@rhua ~]#
======

Expected results:
rhui-manager shouldn't be aborted. I should stay at the CDS screen.