as described by POSIX.1-2008
(see http://pubs.opengroup.org/onlinepubs/9699919799/functions/rename.html

)

Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>

silently discard the response body, needed for apache/mod_dav and maybe other dav servers which return an html body

fix rebase, use 'object::user:<username>' or 'object::store:<storageid> as storage id, by default use container/bucket name for storageid, make storageid configurable, store user only for HomeObjectStoreStorage, change updateObject() to writeObject()

add autocreate config option for containers, implement autocreate and delete of containers, use generated container names for tests