Add trove to ch_getstart

Also, add Database Service to the glossary.

Minor edits in ch_getstart

Change-Id: Id28ce2c304c907f283271bbd2dea6bf476f3d14d
Add trove to CLI overview and install sections

Add trove to the introductory chapter of the CLI guide.

Change-Id: Ieb3cec72b81d3d4ebccc1cf5b214ca7ecf160ca7
Merge "Add trove to ch_getstart"
Merge "Add trove to CLI overview and install sections"