gnt-chi cluster retirement

once we have done the mass VM migration from gnt-chi to gnt-dal (#40972 (closed)), we should retire the old gnt-chi machines that are still around.

for each machine, we need to go through the retire-a-host procedure. special care should probably be taken with the SANs as well.

• chi-node-01 (wiped at 67.84%)
• chi-node-02 (wiped 100%)
• chi-node-03 (wiped 100%)
• chi-node-04 (wiped 100%)
• chi-node-05 (already done in #40738 (closed))
• chi-node-06 (wiped 100%)
• chi-node-07 (partially wiped)
• chi-node-08 (partially wiped)
• chi-node-09 (wiped 100%)
• chi-node-10 (wiped 100%)
• chi-node-11 (already done in #41071 (closed))
• chi-node-12 (wiped 100%)
• chi-node-13 (wiped 100%)
• chi-node-14 (shipped to dallas, see #40968 (closed))
• moly and peninsulare (see #29974 (closed))

each server will follow the normal retirement procedure except those steps which will be done in one batch:

• nagios
• power-grep
• remove from tor-passwords
• remove from DNSwl (N/A)
• remove from docs
• remove from reverse DNS
• remove from racks (the wipe is done individually, but the unracking will be issued to cymru all at once) update: rack removal requested from cymru

SAN servers retirement:

• chi-san-01
• chi-san-02
• chi-san-03
• chi-san-04