~ubuntu-server subscription changes

[robie.basak at canonical.com]

The following subscriptions are superfluous:
  augeas
  convoy
  dbconfig-common
  ibmasm-utils
  ldns
  libdumbnet
  libesmtp
  liblinear
  libpam-radius-auth
  libparse-yapp-perl
  libsdl1.2
  lxc
  lxcfs
  lxd
  maas-enlist
  mailman
  moin
  mysql-5.7
  netcf
  nmap
  parsedatetime
  php7.2
  php8.0
  php8.2
  postgresql-10
  postgresql-13
  postgresql-15
  python-charset-normalizer
  python-recaptcha
  python-ws4py
  ruby-json
  ruby2.5
  ruby3.1
  squid3
  ubuntu-virt
  urlgrabber
  xen
Superfluous subscriptions removed