Modified swift-client tox.ini configuration to enable code coverage
report in console output.

Change-Id: I60276d6a87c62f4a112b01d97ab35a545d4e5462

According to the bindep docs
(http://docs.openstack.org/infra/bindep/readme.html#profiles),
we can specify profiles for each entry listed.

Also added a bindep env to tox.ini.

Change-Id: Ifb59d3ef2934c3d72ba84b337c38bb7eb14774bb

This should make it more clear to users that they may want to install
it.

Change-Id: I8bb4f3eba1fc6d2b7b23c3bd51663678e755a69e

See change I74fb5122e80a223aaa70afaeec7a7c585aa33577 for the
previous discussion. But basically, if you run tox -e py27
then tox -e py34, the latter fails with "db type could not
be determined", because of stuck .testrepository/times.dbm.

This patch fixes it by clearing the *.dbm*. Should be safe
as long as periods aren't used commonly in stable file names.

Change-Id: I617eca308261f291c510c8cbd432779f1c00b182

We need to do this because some of the py34 testing that
python-swiftclient uses depends on this variable.  The reason we don't
see the issue in the gate, is because current bare-trusty images have
this set on the jenkins shell user.

When we move to just using DIBs, the variable won't be setup by
default and python3 tests will fail.

For more information:
  https://review.openstack.org/282898

Change-Id: Id9017f31b0543bccac9c07b83237b909e2bd2b0c
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

"Python 3.3 support is being dropped since OpenStack Liberty."
written in following URL.
https://wiki.openstack.org/wiki/Python3

And already the infra team and the oslo team are dropping py33
support from their projects.

Since we rely on oslo for a lot of our work, and depend on infra
for our CI, we should drop py33 support too.

Change-Id: Ia8f2b26e446175b0d892a11952ef3dc11dcdc73c
Closes-Bug: #1526170