Use deps extra for optional requirements

Related-Bug: #1621384
Change-Id: I227c121b69ac1f51ed922e0b11bec005928aacab

requirements.txt

@@ -13,7 +13,6 @@ kafka-python<1.0.0,>=0.9.5 # Apache-2.0
 keystonemiddleware!=4.1.0,>=4.0.0 # Apache-2.0
 lxml>=2.3 # BSD
 msgpack-python>=0.4.0 # Apache-2.0
-oslo.db>=4.1.0 # Apache-2.0
 oslo.concurrency>=3.5.0 # Apache-2.0
 oslo.config>=3.9.0 # Apache-2.0
 oslo.i18n>=2.1.0 # Apache-2.0

setup.cfg

@@ -31,6 +31,18 @@ packages =
 data_files =
     etc/ceilometer = etc/ceilometer/*
 
+[extras]
+gnocchi =
+    gnocchiclient>=2.2.0 # Apache-2.0
+mongo =
+    pymongo!=3.1,>=3.0.2 # Apache-2.0
+postgresql =
+    oslo.db>=4.1.0 # Apache-2.0
+    psycopg2>=2.5 # LGPL/ZPL
+mysql =
+    oslo.db>=4.1.0 # Apache-2.0
+    PyMySQL>=0.6.2 # MIT License
+
 [entry_points]
 ceilometer.notification =
     instance = ceilometer.compute.notifications.instance:Instance

test-requirements.txt

@@ -8,7 +8,6 @@ elasticsearch>=1.3.0 # Apache-2.0
 fixtures<2.0,>=1.3.1 # Apache-2.0/BSD
 happybase!=0.7,>=0.5,<1.0.0;python_version=='2.7' # MIT
 mock>=1.2 # BSD
-PyMySQL>=0.6.2 # MIT License
 os-win>=0.2.3 # Apache-2.0
 oslo.cache>=1.5.0 # Apache-2.0
 # Docs Requirements
@@ -17,9 +16,6 @@ oslosphinx!=3.4.0,>=2.5.0 # Apache-2.0
 reno>=1.6.2 # Apache2
 oslotest>=1.10.0 # Apache-2.0
 oslo.vmware>=1.16.0 # Apache-2.0
-psycopg2>=2.5 # LGPL/ZPL
-pymongo!=3.1,>=3.0.2 # Apache-2.0
-gnocchiclient>=2.2.0 # Apache-2.0
 python-subunit>=0.0.18 # Apache-2.0/BSD
 sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2 # BSD
 sphinxcontrib-httpdomain # BSD

tox.ini

@@ -4,8 +4,9 @@ skipsdist = True
 envlist = py34,py27,py35,functional,py34-functional,py35-functional,pep8
 
 [testenv]
-deps = -r{toxinidir}/requirements.txt
+deps = .[mongo,mysql,postgresql,gnocchi]
        -r{toxinidir}/test-requirements.txt
+
 install_command = pip install -U {opts} {packages}
 usedevelop = True
 setenv = VIRTUAL_ENV={envdir}