Generated hostnames in 2.0 are much less friendly than 1.9

Generated hostnames in MAAS 2.0 are significantly less friendly than those generated in MAAS 1.9. This change appears due to moving from an internal small-ish list of words to using the python-petname library.

I find these to be very difficult to work with compared to the old names, and do not wish to really use a single name out of 20 generated in MAAS 2.0, compared to MAAS 1.9 where the majority were generally favourable.

The expanded list contains many words which are more complex to read, remember or pronounce. At brief glance, I think that major contributing factors to this are
 (1) Many adjectives are much longer with more syllables
 (2) Many adjectives are further complicated by inverse versions or similar (e.g. non- or un-)
 (3) Names generally have much more varied spelling and are less likely to be already known, making them more difficult to remember and spell.

Here are some examples from 1.9 & 2.0 illustrate the difference, based on actual names I got when doing my deployment on both versions.

MAAS 1.9:
sleepy-toy
private-cracker
lovable-kiss
worthy-sweater
charming-play
only-observation
weepy-view
talkative-middle

MAAS 2.0:
infectious-carrie
annexable-keaton
conflictory-marilou
splanchnologic-jayleen
uncommendatory-lamonica
misformed-lurlene
unappareled-olin
abominable-aryanna
semicarbonate-vesta
oversorrowful-marge
furtive-clarinda
nonprobatory-thu
noncouperative-knox
throneless-earlean
complaisant-deena
retreatal-gricelda
aeneous-coreen
denumerable-lorretta