Implement missing operations on Fake Connector

[rvelaVenafi]

The FakeConnector class is missing several operations. These operations should be returning mockup data for testing or demoing purposes.

The following operations need implementation:

• renew_cert(self, request, reuse_key=False):
• read_zone_conf(self, tag):
• import_cert(self, request):
• get_policy(self, zone):
• set_policy(self, zone, policy_spec):
• request_ssh_cert(self, request):
• retrieve_ssh_cert(self, request):
• retrieve_ssh_config(self, ca_request):