Addresses a TODO in test/functional/test_account.py where
an account metadata test was having to clean up tempurl keys
in the account metadata that were left by another test in
a different module. This cleanup is necessary because tests
in test_account.py fail if there is any pre-existing
account metadata.
This patch:
* makes the tempurl tests clean up their keys from account
metadata.
* makes the test_account.py:TestAccount class remove any
pre-existing metadata before attempting any tests and
replacing that metadata when all the tests in that class
have completed. This is more robust than the existing code
which only removes any tempurl keys that might be in the
account - now you could have x-account-meta-foo = bar in
the test account and test_account.py will still pass.
* consolidates some common setup code currently repeated for
many of the functional test classes into into a BaseEnv class.
Change-Id: I874a9e23dfcdd1caa934945b46089f11b9f6de65
9f30c5d31e