The ssh application is not installed on all test hosts. Catching the
call to ssh:start/0 allows the the netconf tests to be nicely skipped
if ssh does not exist.

* siri/cuddle-master:
  Add short sleep when killing slave nodes
  [ct test] Do reload_config instead of get_config

* peppe/common_test/OTP-13615:
  Fix problem with incorrect type of timestamps

OTP-13615

OTP-13615

The test case config_dynamic_SUITE:test_localtime_update sometimes
failed on slow machines, since the initial value of 'localtime' is
fetched with ct:get_config instead of ct:reload_config. The value is
then from the test run start, not from the time of the ct:get_config
call. This is now corrected.

* siri/cuddle-master:
  [ct test] Wait for event receiver to be unregistered
  [ct test] Flush messages from old client after close in telnet server
  [ct test] Use monitor instead of ct:sleep
  [ct test] Check that crypto is loaded, or skip netconf tests
  [ct test] Reduce amount of data in netconfc1_SUITE:get_a_lot

To avoid badarg when two tests are run within the same test case.

Since the same erlang process is used for subsequent telnet
connections, messages from old clients must be flushed after close.

ct_gen_conn_SUITE_data/conn_SUITE.erl uses a lot of ct:sleep(100) when
waiting for processes to exit. This commit removes all the sleeps and
introducess monitor instead.

Tests for ct_netconfc are failed instead of skipped if crypto can not
be loaded. This is now corrected.