Fixed and restored previously skipped test CallTestCase.test_timeout
_connect_to_host() and get_single_hosts() now accept optional timeout
parameter.
_connect_to_host() accepts optional retry parameter
If timeout value (in seconds) is greater than 0, the connection attempts
will be retried $retry times with a specified timeout.
Change-Id: I1c897d917d0defda581b8ff62e7a67e32f011fee
Closes-Bug: #1499713