libceph: fix unaligned accesses in ceph_entity_addr handling

[ Upstream commit cede185b1ba3118e1912385db4812a37d9e9b205 ]

GCC9 is throwing a lot of warnings about unaligned access. This patch
fixes some of them by changing most of the sockaddr handling functions
to take a pointer to struct ceph_entity_addr instead of struct
sockaddr_storage.  The lower functions can then make copies or do
unaligned accesses as needed.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Stable-dep-of: 7563cf17dce0 ("libceph: use kernel_connect()")
Signed-off-by: Sasha Levin <sashal@kernel.org>