Installation Migration is forced when enabling aem reconfig

[Carnifrex]

When reconfiguring AEM we put the "enable_aem_reconfiguration" on true, but this will also set the "enable_aem_installation_migration" on true. The migration should get a separate variable as the migration is not done on every reconfiguration.

https://github.com/shinesolutions/puppet-aem-curator/blob/master/manifests/config_publish.pp#L121

https://github.com/shinesolutions/puppet-aem-curator/blob/master/manifests/config_author_primary.pp#L127

[Carnifrex]

Proposed fix: #168

[mbloch1986]

@Carnifrex Thanks for the tiicket and the PR.

Before we can merge you're PR we need to update the aem-aws-stack-provisioner so we can keep the backward compatibility.

But yes I do agree with you that it might be the best to have a seperated variable to enable the aem installation migration.