Add tox entry for py35 tests

Added an entry for the py35 tests.  Put the default
values into a py3base entry and referred to them
from both py34 and py35.

Change-Id: Ibd9e77c24f56e7886459fce00a4ed33b3e9e1011

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py34,py27,pep8,checkbuild,checklinks
+envlist = py35,py34,py27,pep8,checkbuild,checklinks
 minversion = 1.6
 skipsdist = True
 
@@ -26,11 +26,20 @@ commands =
     bash -c "find trove -type f -regex '.*\.pot?' -print0 | \
              xargs -0 -n 1 msgfmt --check-format -o /dev/null"
 
-[testenv:py34]
+[py3base]
 commands = rm -f .testrepository/times.dbm
+           find ./trove -type f -name "*.pyc" -delete
            ostestr --blacklist_file=blacklist-py3.txt --serial
 whitelist_externals = rm
+                      find
 
+[testenv:py34]
+commands = {[py3base]commands}
+whitelist_externals = {[py3base]whitelist_externals}
+
+[testenv:py35]
+commands = {[py3base]commands}
+whitelist_externals = {[py3base]whitelist_externals}
 
 [testenv:debug]
 commands = oslo_debug_helper {posargs}