userman: handle weak passwords
userman: handle weak passwords

busybox prompts for a password three times if its weak.

Resolves openbmc/openbmc#543.

Change-Id: I7a5ccd10e082844f6b7df065a30ad59974f1d532
Signed-off-by: Brad Bishop <713d098c0be4c8fd2bf36a94cd08699466677ecd@fuzziesquirrel.com>

openbmc/phosphor-networkd,openbmc/phosphor-networkd