Resolve the OpenPaaS ids with DAV

[chibenwa]

Description of the bug

This way TMail will not depend on OpenPaaS and would be more compatible with DAV clients.

OUTCOME: Remove the OpenPaaS client & related code

How

curl -k -u '[email protected]:xxxxxxxxxxxxxxxxx' https://dav.linagora.com -X PROPFIND -d '<?xml version="1.0" encoding="UTF-8" ?><D:propfind xmlns:D="DAV:"><D:prop><D:displayname/><D:principal-collection-set/><D:current-user-principal/></D:prop></D:propfind>' | xmllint --format - 

<?xml version="1.0"?>
<d:multistatus xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns" xmlns:cal="urn:ietf:params:xml:ns:caldav" xmlns:cs="http://calendarserver.org/ns/" xmlns:card="urn:ietf:params:xml:ns:carddav">
  <d:response>
    <d:href>/</d:href>
    <d:propstat>
      <d:prop>
        <d:principal-collection-set>
          <d:href>/principals/users/</d:href>
          <d:href>/principals/resources/</d:href>
          <d:href>/principals/domains/</d:href>
        </d:principal-collection-set>
        <d:current-user-principal>
          <d:href>/principals/users/5f50a663bdaffe002629099c/</d:href>
        </d:current-user-principal>
      </d:prop>
      <d:status>HTTP/1.1 200 OK</d:status>
    </d:propstat>
    <d:propstat>
      <d:prop>
        <d:displayname/>
      </d:prop>
      <d:status>HTTP/1.1 404 Not Found</d:status>
    </d:propstat>
  </d:response>
  <d:response>
    <d:href>/principals/</d:href>
    <d:propstat>
      <d:prop>
        <d:principal-collection-set>
          <d:href>/principals/users/</d:href>
          <d:href>/principals/resources/</d:href>
          <d:href>/principals/domains/</d:href>
        </d:principal-collection-set>
        <d:current-user-principal>
          <d:href>/principals/users/5f50a663bdaffe002629099c/</d:href>
        </d:current-user-principal>
      </d:prop>
      <d:status>HTTP/1.1 200 OK</d:status>
    </d:propstat>
    <d:propstat>
      <d:prop>
        <d:displayname/>
      </d:prop>
      <d:status>HTTP/1.1 404 Not Found</d:status>
    </d:propstat>
  </d:response>
  <d:response>
    <d:href>/calendars/</d:href>
    <d:propstat>
      <d:prop>
        <d:principal-collection-set>
          <d:href>/principals/users/</d:href>
          <d:href>/principals/resources/</d:href>
          <d:href>/principals/domains/</d:href>
        </d:principal-collection-set>
        <d:current-user-principal>
          <d:href>/principals/users/5f50a663bdaffe002629099c/</d:href>
        </d:current-user-principal>
      </d:prop>
      <d:status>HTTP/1.1 200 OK</d:status>
    </d:propstat>
    <d:propstat>
      <d:prop>
        <d:displayname/>
      </d:prop>
      <d:status>HTTP/1.1 404 Not Found</d:status>
    </d:propstat>
  </d:response>
  <d:response>
    <d:href>/addressbooks/</d:href>
    <d:propstat>
      <d:prop>
        <d:principal-collection-set>
          <d:href>/principals/users/</d:href>
          <d:href>/principals/resources/</d:href>
          <d:href>/principals/domains/</d:href>
        </d:principal-collection-set>
        <d:current-user-principal>
          <d:href>/principals/users/5f50a663bdaffe002629099c/</d:href>
        </d:current-user-principal>
      </d:prop>
      <d:status>HTTP/1.1 200 OK</d:status>
    </d:propstat>
    <d:propstat>
      <d:prop>
        <d:displayname/>
      </d:prop>
      <d:status>HTTP/1.1 404 Not Found</d:status>
    </d:propstat>
  </d:response>
</d:multistatus>