Explicitly document requirements for 3rd party testing

As we are moving towards requiring more and more third party testing, we
should make sure we have a central and explicit list of requirements.
These are the requirements to have a voting third party testing system,
not the requirements of what the system should be running (to count a
driver as fully tested).

Change-Id: Ic1e1cdf9af9cd21e29a0e768d5d78ae4f84108fb
Change mysql-devel to community-mysql-devel in Fedora

Fedora 19 and onwards doesn't support (officially)
mysql anymore, so installmysql-devel conflicts
with mariadb and community-mysql

Change-Id: I3142aa686747a6704396aa4fe005dc04c7e7d15b
Merge "Change mysql-devel to community-mysql-devel in Fedora"
Merge "Explicitly document requirements for 3rd party testing"