Oslo.config deprecated parameter enforce_type and change its
default value to True in Ifa552de0a994e40388cbc9f7dbaa55700ca276b0.
Nova peridic py35 job failure due to the DeprecationWarning: "Using the
'enforce_type' argument is deprecated in version '4.0' and will be
removed in version '5.0': The argument enforce_type has changed its
default value to True and then will be removed completely."[1]
So need clean up usage of enforce_type.
Note this patch also change enforce_type from False to default value
True in test__get_node_console_with_reset_wait_timeout. We should test
as runtime, we can use float type to test when config option
serial_console_state_timeout is float.
[1] http://logs.openstack.org/periodic/periodic-nova-py35-with-oslo-master/6eeea0f/testr_results.html.gz
Related--Bug: #1517839
Change-Id: I94915a5c6abbbb739c597025272dc0e25d3ba2ec
213f7120c4