light: fix annoying replay error message
marsadm: show IP only with --verbose
marsadm: fix usage
brick_mem: improve debugging
infra: improve callback debugging
all: improve checking of callback chain
doc: update
userspace: add bugfix for Debian udev rules

Patch received from Jörg Mann by email.

Some Debian versions seem to have typos in their udev rules.
As a consequence, /dev/mars/mydata does not disappear when
leaving primary state.

Other consequences might also exist. In an unreproduced case the
/dev/mars/ object was unlinked while the mount was continuously
active, without causing any harm to operations (besides that
xfs_growfs did not work, which led to the discovery of the
mysterious situation).

Probably the udev userspace may require further fixes.

Fortunately, udev-less systems (as those used by me for testing) are
not affected.
monitoring: update
all: release light0.1stable01