Fix versioning of Video document when incrementing version at creation time using a custom policy

When a custom versioning policy is defined to increment the version when a Video document is created, the working copy gets checked out by a background process (maybe the video conversions), the version of the document becoming 1.0+.

How to reproduce:

• fire up a 10.10 instance with addon nuxeo-dam installed (and ffmpeg command installed) and the following XML contribution deployed:

  <component name="custom-versioning-policies" >
  
      <extension target="org.nuxeo.ecm.core.api.versioning.VersioningService" point="filters">
          <filter id="isDocumentBeingCreatedForTheFirstTime">
              <condition>#{previousDocument==null}</condition>
          </filter>
          <filter id="isCurrentDocumentAVideo">
              <condition>#{currentDocument.type == "Video"}</condition>
          </filter>
          <filter id="isCurrentDocumentAPicture">
              <condition>#{currentDocument.type == "Picture"}</condition>
          </filter>
      </extension>
      <extension target="org.nuxeo.ecm.core.api.versioning.VersioningService" point="policies">
          <policy id="custom-policy-for-videos" order="35" increment="MAJOR">
              <filter-id>isDocumentBeingCreatedForTheFirstTime</filter-id>
              <filter-id>isCurrentDocumentAVideo</filter-id>
          </policy>
          <policy id="custom-policy-for-pictures" order="40" increment="MAJOR">
              <filter-id>isDocumentBeingCreatedForTheFirstTime</filter-id>
              <filter-id>isCurrentDocumentAPicture</filter-id>
          </policy>
      </extension>
  
  </component>
  

• log in the Web UI
• create a Video document with a video file
• the Web UI redirects to the created document, the version is 1.0
• after the video conversions are generated, refresh the page

Expected result: the version is still 1.0
Actual result: the version is 1.0+

Applying the same scenario but with a Picture document does not produce the same faulty result.