Fix console output parse failure with empty elements

Fixes TOOLS-389
Add euca-register --platform

Fixes TOOLS-399
Fix broken RootDeviceName defaulting
Merge branch '3.0-maint'
Merge remote-tracking branch 'sangmin/master'
LB:  Prettify policy parameter printer

Builds on https://github.com/eucalyptus/euca2ools/pull/34
Minor cleanup
Drop default-region from our included config file

Setting aws:us-east-1 as euca2ools' default region sounds reasonable at
first, but when people use environment variables (a.k.a. eucarc) as
their sources of configuration thish causes commands to connect to AWS
when Eucalyptus-equivalent URLs for the services they access are not
defined.  The result is a semi-misleading "The AWS Access Key Id you
provided does not exist in our records" message, so here we just drop it
to prevent this from confusing people who use the default configuration.

Fixes TOOLS-393