Install the man page with `make install`

Signed-off-by: Christophe Vu-Brugier <cvubrugier@yahoo.fr>
Use pragma once instead of include guards

Signed-off-by: Christophe Vu-Brugier <cvubrugier@yahoo.fr>
Store the fully qualified domain name in the entity identifier

Signed-off-by: Christophe Vu-Brugier <cvubrugier@yahoo.fr>
Reduce the length of the iSCSI name to 223 characters

Also fix possible string overflow reported by Coverity in
configfs_target_init().

Signed-off-by: Christophe Vu-Brugier <cvubrugier@yahoo.fr>