Log a warning when reset fails

We attempt a reset but if the installation is being run in a non-tty
friendly way, reset may fail.  Since this isn't really a blocking issue
we shouldn't fail out of the installation but rather log a warning
indicating that the user may need to perform some action.

Change-Id: I26f41457b712810b54d4108f735a1db3c88ae8ce
Closes-Bug: #1842677
(cherry picked from commit 67d41db5fa)

tripleoclient/utils.py

@@ -2041,5 +2041,11 @@ def reset_cmdline():
     # only try to reset if stdout is a terminal, skip if not (e.g. CI)
     if not sys.stdout.isatty():
         return
-    sys.stdout.write(run_command(['reset', '-I']))
+    output = ''
+    try:
+        output = run_command(['reset', '-I'])
+    except RuntimeError as e:
+        LOG.warning('Unable to reset command line. Try manually running '
+                    '"reset" if the command line is broken.')
+    sys.stdout.write(output)
     sys.stdout.flush()