If the ssh verification fails, don't continue checking the config. This
could potentially lead to a condition where the charm thinks it's ready
when it's not.

Signed-off-by: Adam Israel <adam.israel@canonical.com>

This adds a little more verbosity to the workload status, and adds and
additional configuration check to verify if the configuration has been
received and processed.

Signed-off-by: Adam Israel <adam.israel@canonical.com>

This patch adds better status messages by differentiating between
configuration settings received and the verification of ssh credentials.

Signed-off-by: Adam Israel <adam.israel@canonical.com>

Don't fail if there's an error raising the interface. I'm seeing this
happen because the interface is already up.

Signed-off-by: Adam Israel <adam.israel@canonical.com>