## What changes were proposed in this pull request?
Sorry about the huge commit, but moving these checks to use the new framework
proved to be more cumbersome than I had thought...
The pre-upgrade check framework inside of Ambari needs to be migrated to the
Ambari API/SPI being developed as part of AMBARI-24685 so that 3rd party stack
developers can use this to compile and deliver their own custom upgrade checks
for their stack.
The following items should be included:
- A way to obtain configuration information about the cluster's services
- Topology information, including services installed and the components/hosts
of the cluster
The existing checks which are not stack-specific should remain in Apache and
altered to use the new framework. This means that the {{ambari-server}} project
will have a dependency on the new module created as part of AMBARI-24685.
Note: Custom checks (such as those for specific services) were removed from
Ambari and will now be delivered via the mpacks...
## How was this patch tested?
Performed several attempts at upgrade checks to make sure the existing checks
still worked.
[ Full content available at: https://github.com/apache/ambari/pull/2429 ]
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