ensure blkid won't update /etc/blkid.tab

/etc/blkid.tab is updated everytime blkid (<2.24) is launched. This patch
prevent this.

See: https://bugs.debian.org/756622
See: https://bugs.debian.org/557707

Reported-by: Dominique Rousseau <d.rousseau@nnx.com>
update expected result
load Socket::GetAddrInfo at compile time

This is a mandatory module
more explicit log messages
log nmap results too
oops
enable inconditionally

No need to check resource availability before execution phase.
more explicit debug messages