K 10
svn:author
V 3
imp
K 8
svn:date
V 27
2018-12-02T23:13:12.073997Z
K 7
svn:log
V 353
Usage cleanup pt 2

Eliminage redundant spaces and nvmecontrol at start of all the usage
strings. Update the usage printing code to add them back when
presenting to the user. Allow multi-line usage messages and print
proper leading spaces for lines starting with a space.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D18403

END