Minor state=absent/present consistency upgrade for apt/yum modules

Most of our modules took state=absent/present.

Yum and apt took state=installed/removed/latest/$version

To make things less likely to cause frustration, absent is now an
alias for 'removed', and 'present' is now an alias for 'installed'.

Users need not make any changes to their playbooks, but if someone
attempts to use absent/present, it will now do what you mean.

--Michael