HUE-2080 [core] Update tours URLs

Updated to gethue.com and added additional content
HUE-296 [core] Add guppy debugger
HUE-296 [core] Add memory usage debug view

Add variable in settings to make it globally available.
[core] Fix LDAP and useradmin group list tests
HUE-2037 [search] Index a file or hive table easily

Add a collection manually.
Add a collection from a file.
Parse file with APIs.
HUE-2037 [core] Create new app for collection management
Merge remote-tracking branch 'remotes/origin/create-collection' into create-collection