Updates for tools/info.sh

* Handle local.conf localrc section
* remove blank lines
* rather than removing password lines, just remove the password itself to at
  least show which password vars have been set

Change-Id: Ieca9baaf03e53b23e336944ad0ed2581c9bee460
Merge branch 'info-update' into dt-test
Merge branch 'samples-update' into dt-test
Merge branch 'cleaner' into dt-test