Make `exceptions` argument to `retry` non-optional

Change-Id: I6879b467395af9420bb36bbc70226b4dda713dc9
Remove otherwise-unused `success` feature from `retry`

Change-Id: I49bdde0c67d27179bae3a1baf5b00c9e110f957e
Rework `retry`

Change-Id: Iffa2c684482c90aa616c7b8d5e6ea832cc3fd822
Localize `lvm.LVM.activate_lv` patch

Change-Id: Icb7520fbaa632d799ae005b26f6afad79592198a