K 10
svn:author
V 8
mckusick
K 8
svn:date
V 27
2019-01-28T21:46:05.936121Z
K 7
svn:log
V 176
MFC of 343449 and 343483

Update tunefs to allow '_' in label names.

Update tunefs and newfs error messages to note that '_' is allowed
in label names.

Sponsored by: Netflix

END