debian: install targetcli manpage
debian: install targetcli manpage

Fixes #42

Signed-off-by: Christophe Vu-Brugier <1930e27f67e1e10d51770b88cb06d386f1aa46ae@fastmail.fm>

agrover/targetcli-fb,cvubrugier/targetcli-fb,cloud4life/targetcli-fb