fixes bug 1049017
As per the bug report, the -remove- form of deletion only works with
meta headers and not with x-container-read and x-container-write.
This patch by Yukihiro KAWADA detects the container acls and sends
them through to the backend empty like the other metadata values.
patch2 extends metadata-helper in ContainerController tests so that
the new functionality can be tested.
patch3 changes the k.lower().startswith() commands for read/write to
a single k.lower - thanks David :)
patch4 fixes PEP8
patch5 fixes more than two hundred pep8 errors. Except one,
where the pep8 tool complains of overindent, or underindent
depending on the position on the line. No idea how to fix that one.
patch6 fixes the remaining pep8 error - thanks Darrell
Change-Id: I36c2dd72b4636136c5ce7db414bf2b61501090ad
124e75bc1b