Remove git-review from DIB elements

Looking at the git history for git-review, it isn't clear where we are
actually using it.  Additionally, codesearch.o.o seems to show some
projects already managing git-review as a requirement.

Ensure everybody is okay with this change by sending a ML post too.

Change-Id: I53a45736de74b842c5c01982bb153f04bff5622c
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

nodepool/elements/infra-package-needs/install.d/10-pip-packages

@@ -20,9 +20,7 @@ if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
 fi
 set -e
 
-# TODO(fungi): switch jobs to use /usr/git-review-env/bin/git-review
-packages='git-review==1.25.0 '
-packages+='tox '
+packages='tox'
 
 for package in $packages ; do
     pip install $package