Currently the functional tests fail if the storage_url contains a quoted
IPv6 address because we try to split on ':'.
But actually we don't need to split hostname and port only in order to
combine it back together lateron. Use the standard urlparse() function
instead and work with the 'netloc' part of the URL which keeps hostname
and port together.
Change-Id: I64589e5f2d6fb3cebc6768dc9e4de6264c09cbeb
Partial-Bug: 1656329
b4f08b6090