Add more comments to the switch discovery code
Add more comments to the switch discovery code

Change-Id: Iaa37f6caf6660d374947d5b2b134240b2417411c

Reviewed-By: 790b96b72b5ebbbfb73a2caa0f14d8894a9e0fd7@morganstanley.com

guillaume-philippon/aquilon,quattor/aquilon,stdweird/aquilon,guillaume-philippon/aquilon,stdweird/aquilon,guillaume-philippon/aquilon,quattor/aquilon,quattor/aquilon,stdweird/aquilon