(FACT-2638) Use puppet AIO VERSION file to specify AIO version

[BogdanIrimie]

Puppet aio_agent_version will be read from the location where puppet AIO is installed. By doing this, all facter instances installed on the system will be able to detect agent AIO version.

[gimmyxd]

I have a small concern with this approach as we will ship facter as a gem component in Puppet(that means it can be managed using puppet gem command). This means that it will be upgradable using /opt/puppetlabas/puppet/bin gem update facter which can install a new version of facter that will not have the agent version file.

[BogdanIrimie]

Change implementation to read agent aio version from puppet installation path.

[gimmyxd]

@IrimieBogdan there is a small difference comparing facter 4 to facter 3

❯ /opt/puppetlabs/bin/facter --version
3.14.12 (commit 7b4c3bd15d90faf9978e7ef32a34e8cc91a1ca73)
❯ /opt/puppetlabs/bin/facter aio_agent_version
6.16.0.75


❯ git log -n 1
commit d775e63db4025732e60151735825762960f2ff0f (HEAD -> FACT-2638, origin/FACT-2638)
❯ bundle exec facter aio_agent_version
6.16.0.75.g625aab0b


❯ /opt/puppetlabs/bin/puppet --version
6.17.0