This element installs package to ensure that the resulting image
provides the binaries outlined in posix specification [1]. This solves
some problems such as cron missing from the ubuntu-minimal images, and
hopefully minimizing the problems from similar problems in the future.
This is the image size difference:
Resulting qcow image sizes:
Ubuntu Ubuntu-Minimal Debian Centos7
None 334MB 330MB 352MB 470MB
Posix 353MB 375MB
Posix+ 354MB 374MB 406MB 471MB
Posix+ = Posix + gcc + cssc
[1] http://pubs.opengroup.org/onlinepubs/9699919799/idx/utilities.html
Change-Id: I2a8f77bf8a0fdb04b328e56425d43a60eb3f7eed
