Revert "devapp: remove trailing slash from /owners handler"
Revert "devapp: remove trailing slash from /owners handler"

This reverts commit 768b50a198051f8a13b71e076ebe35c34f190dcb (CL 171360)

Reason for revert: breaks existing gopherbot client

Change-Id: I553f11ce21475ac1f073462a739acc9b2ee79ed6
Reviewed-on: https://go-review.googlesource.com/c/build/+/171460
Reviewed-by: Bryan C. Mills <1c8aad60184261ccede67f5c63a0d2a3bf3c9ff4@google.com>

golang/build,golang/build,golang/build,golang/build