Merge pull request #8970 from georgexsh/hyphen

unify `–`(en dash) to `-` when specifying options
*: transition usage of libcontainer/user to new interface

This patch transitions the use of the old libcontainer/user interface to
the new and improved libcontainer/user interface.

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com> (github: cyphar)