ansible: fix scripts for LinuxONE and SmartOS

[richardlau]

Move non-package manager ccache tasks into partial tasks to
avoid the different platforms interfering which each other.

Fixes: #2533

This refactors by replacing ansible/roles/baselayout/tasks/ccache.yml and
platform specific ccache tasks in ansible/roles/baselayout/tasks/main.yml
with platform specific versions under ansible/roles/baselayout/tasks/partials/ccache.

[richardlau]

One thing I've not changed is the version of ccache being installed, which on AIX, LinuxONE and SmartOS is not the latest (3.7.2 on AIX and 3.6 on LinuxONE and SmartOS).

The replaced ansible/roles/baselayout/tasks/ccache.yml was downloading ccache source from https://www.samba.org/ftp/ccache/ but ccache stopped uploading to there after ccache 3.6: https://lists.samba.org/archive/ccache/2019q2/001580.html

I'd prefer to look at that separately in a follow up PR if necessary.