Fix a bug where ctx.config['targets'] was looped through again
in connect().  The bug caused vm behavior to happen for a
target if any of the machines in the cluster was a vm.  The code
was also changed to set the key to none only if rsa or dsa keys
were used on a vm.

Fixes: 7113
Signed-off-by: Warren Usui <warren.usui@inktank.com>
Merge pull request #172 from ceph/wip-teuthvmcon-wusui

Fix a bug where ctx.config['targets'] was looped through again