Add releasenotes for baremtal tests removal

Patch - Id518a6d87d0949737cd1c50cb6a83149b85e5f85
remove the baremetal tests from tempest.

This patch adds release notes which got missed in
previous patch.

Change-Id: Iba3b613aa7bd00abdada7e503c366acc7a12e19d
1 file changed