Clean up more things before running unit tests
Clean up more things before running unit tests

Apparently some versions of py3 will drop symlinks in the venv.

Change-Id: I77c52b6ad776ab75c4f9713290cc42a1fcb6e0f7

openstack/swift,openstack/swift,swiftstack/swift,tipabu/swift,swiftstack/swift,openstack/swift,tipabu/swift,openstack/swift,tipabu/swift,swiftstack/swift,tipabu/swift