Move application definitions into individual definition files

[binglot]

I'd like to suggest 2 changes:

• I think having a label for Hadoop is unnecessary, so I'd remove it.
• I'd move the Hadoop-, Tomcat-, Containerd- and Docker-related definitions from their own files into the Applications yaml file. There's also the Kubernetes file could potentially also go into the Applications yaml file but the file is large enough that I'd keep it separate.

[sydp]

Have created a new PR for third party Linux based servers. We could move Hadoop, Tomcat into this. WDYT?

#521

[joachimmetz]

@sydp @binglot what is the status of this? Give #512 was merged is this completed?

[sydp]

Discussed with @binglot OOB and this issue was a suggestion to reorganise a number of application definitions into their own yaml file and since this has not yet happened, the issue has not been addressed.

[joachimmetz]

@sydp I would recommend a proposal/documentation on how to organize such files, so it can be enforced going forwards similar to a style guide (maybe by the validator?).

[joachimmetz]

Per chat with @sydp mostly cosmetic changes, will revisit in the future.