Clean up tox.ini

* move common commands to [testenv]
* add DB specific deps to [testenv:lower-constraints]

Change-Id: I026365b27a579e1b4d80c86149feb675ff1a75d8

tox.ini

@@ -26,30 +26,17 @@ deps =
 commands =
   find {toxinidir} -type f -name "*.py[c|o]" -delete
   rm -Rf .testrepository/times.dbm
-
-[testenv:py27]
-basepython = python2.7
-commands =
-  {[testenv]commands}
-  ostestr {posargs}
-
-[testenv:py35]
-basepython = python3.5
-commands =
-  {[testenv]commands}
   ostestr {posargs}
 
 [testenv:cover]
 commands =
-  {[testenv]commands}
   coverage erase
-  python setup.py test --coverage --testr-args='{posargs}' --coverage-package-name=monasca_persister
+  python setup.py test --coverage --testr-args='{posargs}' \
+    --coverage-package-name=monasca_persister
   coverage report
 
 [testenv:debug]
-commands =
-  {[testenv]commands}
-  oslo_debug_helper -t monasca_persister/tests {posargs}
+commands = oslo_debug_helper -t monasca_persister/tests {posargs}
 
 [testenv:pep8]
 deps =
@@ -98,5 +85,6 @@ local-check-factory = monasca_persister.hacking.checks.factory
 basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
+  .[influxdb,cassandra,elasticsearch]
   -r{toxinidir}/test-requirements.txt
   -r{toxinidir}/requirements.txt