Fix trovestack tox job

Change-Id: I9662c4c23f3d2879d78e26fe4b32a6f55b6cfb99

test-upper-constraints.txt

@@ -1 +1 @@
-git+https://opendev.org/openstack/python-troveclient#egg=python-troveclient
+git+https://opendev.org/openstack/python-troveclient@master#egg=python-troveclient

tox.ini

@@ -106,11 +106,7 @@ deps =
   -r{toxinidir}/requirements.txt
 
 [testenv:trovestack]
-skip_install = True
 changedir = {toxinidir}/integration/scripts
 passenv = *
 commands =
-    pip install --no-binary :all: {toxinidir} \
-      -c/opt/stack/trove/test-upper-constraints.txt \
-      -chttps://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt
     ./trovestack {posargs}