Check if zowe.*Directory is not nested in zowe.runtimeDirectory

[Martin-Zeithaml]

Schema validation is checking, if the directories used for Zowe are valid USS paths. But that's not sufficient, user can define e.g. zowe.logDirectory (or other directories) "inside" zowe.runtimeDirectory.
This is not good for couple reasons:

• We recommend to set zowe.runtimeDirectory as read-only
• zwe support will detect new files when calculating fingerprints
  • This is reported even the original files are fine

Such setting should invoke (at least) a warning:

zowe:
  runtimeDirectory: /global/zowe
  logDirectory: /global/zowe/logs
  workspaceDirectory: /global/zowe/workspace
  extensionDirectory: /global/zowe/extensions

There are more directories used, like java, node, certificates, but the check for the directories in the example should be fine.

[skurnevich]

I'v added a basic warning as part of this PR
But it could be done in a better way, so lets keep this task as open.