Move CONNECTORS-553-2 to CONNECTORS-553

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-553@1550467 13f79535-47bb-0310-9956-ffa450edef68
Fix PROTOCOL_DEFAULT_VALUE

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-553@1550470 13f79535-47bb-0310-9956-ffa450edef68
Add support for IMAP-SSL and POP3-SSL

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-553@1550742 13f79535-47bb-0310-9956-ffa450edef68
Fix metadata filter code.

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-553@1550801 13f79535-47bb-0310-9956-ffa450edef68
Pull up changes from old CONNECTORS-553 branch

git-svn-id: https://svn.apache.org/repos/asf/manifoldcf/branches/CONNECTORS-553-2@1552344 13f79535-47bb-0310-9956-ffa450edef68