doozer_init script updates

[mreiferson]

doozer_init has some particular requirements around hostname that may not work well with all infrastructure configurations.

[mreiferson]

updated title/description.

specifically, I'm curious to hear alternative ideas w/r/t how we use a # in our hostnames to determine a /ctl/cal/<id>. One that I can think of is hashing the hostname which would eliminate the need to have a number in the short hostname portion.

[mreiferson]

merging this because it should have been a part of the original PR that went in #34

It's certainly not perfect (see #58), but the script in master is incomplete and this adds the option to specify the ID

P.S. end of year open PR cleanup