allow args for all versions of rails for ConnectionPool#release_connection
allow args for all versions of rails for ConnectionPool#release_connection

the conditional was wrong - it should have been for Rails 2, which is
no longer supported

Change-Id: Iec49a5951e7e2fcc6f6af7d52b7a22ddd3f24208
Reviewed-on: https://gerrit.instructure.com/53266
Tested-by: Jenkins
Reviewed-by: Ethan Vizitei <73eeb0b2f65d05a906adf3b21ee1f9f5a2aa3c1c@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

instructure/switchman,instructure/switchman,krrg/switchman