Stabilize the hostid for RPM installations.

ZFS requires a stable hostid to recognize foreign pool imports,
but the hostid of a Linux system can change if the /etc/hostid
file is missing, particularly during DHCP lease updates.

Ensure that the system hostid is stable by creating the
/etc/hostid file from the output of the /usr/bin/hostid utility.
The /sbin/genhostid utility that is provided by the initscripts
package is not used because it creates a random hostid, which
breaks upgrades on systems that already have the SPL module
installed.

The external `printf` is used because the dash builtin lacks
the byte format.  Conveniences like a ${HOSTID:$ii:2} substring
range or a `sed` one-liner are similarly avoided.

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