Fix yang module file names

Fix yang module file names

This patch fixes these two warnings:

2017-04-25 19:34:22,251 | INFO  | ... | Provided module name bgp-evpn.yang does not match actual text odl-bgp-evpn@2016-03-21.yang, corrected
2017-04-25 19:34:03,806 | INFO  | ... | Provided module name bgp-path-selection-mode.yang does not match actual text odl-bgp-path-selection-mode@2016-03-01.yang, corrected

We do not have to include the revision, as that mismatch leads
only to a debug.

Change-Id: I58dddf24128804a6151ac84369030d8e5f8fcac3
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>