network/net-lib.sh: do not enforce iscsi target name policy

also untabified
replaced ip=auto with ip=dhcp in the documentation

https://bugzilla.redhat.com/show_bug.cgi?id=1086931
Support spaces in mount_nfs (#1109933)

nfs paths may contain spaces, make sure they are preserved when passed
to nfs_to_var and mount.

Related: rhbz#1109933