Restoring a file to old version creates new file version

[dpakach]

steps to reproduce

• Given user "Alice" has uploaded file with content "uploaded content" to "textfile0.txt"
• And user "Alice" has uploaded file with content "version 1" to "textfile0.txt"
• And user "Alice" has uploaded file with content "version 2" to "textfile0.txt"
• And user "Alice" has restored version index "1" of file "textfile0.txt"
• And user "Alice" gets all the versions for file "textfile0.txt"

Expected result

• The number of versions should be 2 as we get in oc10 core with default storage

Actual result

• The number of versions is 3 there are 2 versions with same content

The test for this is in apiVersions/fileVersions.feature:438