Install requirements during the correct tox phase

Glance isn't explicitly installing requirements, so add requirements
as tox deps in such a way that they'll be properly constrained by the
current openstack upper-constraints.

This change also bumps the version of psycopg to that of the current
upper-constraints in test-requirements and lower-constraints.  (The
version in our current lower-constraints is subject to the "could not
determine PostgreSQL version from '10.x'" error, which causes the
lower-constraints job to fail.)

Change-Id: I1bb5759e6b1e3f8545ab417617072a61323b59a7
Closes-bug: #1852356

lower-constraints.txt

@@ -87,7 +87,7 @@ pika-pool==0.1.3
 pika==0.10.0
 prettytable==0.7.1
 psutil==3.2.2
-psycopg2==2.6.2
+psycopg2==2.8.4
 pycadf==2.7.0
 pycparser==2.18
 pyflakes==0.8.1

test-requirements.txt

@@ -27,7 +27,7 @@ doc8>=0.6.0 # Apache-2.0
 
 # Optional packages that should be installed when testing
 PyMySQL>=0.7.6 # MIT License
-psycopg2>=2.6.2 # LGPL/ZPL
+psycopg2>=2.8.4 # LGPL/ZPL
 pysendfile>=2.0.0;sys_platform!='win32' # MIT
 xattr>=0.9.2;sys_platform!='win32' # MIT
 python-swiftclient>=3.2.0 # Apache-2.0

tox.ini

@@ -18,8 +18,10 @@ setenv =
 # clue for oslo.db to use file-based database.
   OS_TEST_DBAPI_ADMIN_CONNECTION=sqlite:////tmp/placeholder-never-created-nor-used.db
 usedevelop = True
-install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
-deps = -r{toxinidir}/test-requirements.txt
+install_command = pip install {opts} {packages}
+deps = -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+       -r{toxinidir}/test-requirements.txt
+       -r{toxinidir}/requirements.txt
 commands =
     find . -type f -name "*.pyc" -delete
 whitelist_externals = bash