Standard Yang files used in ODL should be stored in one place in order to keep revisions under control. Currently the place is in Mdsal project (model/ subdirectories).

When multiple revisions of the same module are present in ODL container, care should be taken. Additional filenames should contain revision (e.g. ietf-inet-types@2013-07-15.yang) and each import statement should use revision-date to avoid unexpected errors when parsing.

An example of such error is shown in comments on patch set 2 of https://git.opendaylight.org/gerrit/49828