Blank line fixes related to previous regressions

There were 3 wrongly indented return statements introduced in pep8
pull request [1], then they were fixed again but they were still
missing the blank lines that caused pblaho's autoindenter to indent
the return statements wrong. This commit adds those blank lines.

[1] https://github.com/tuskar/tuskar/pull/52
Merge pull request #60 from jistr/bug/pep8_patch_regressions

Blank line fixes related to previous regressions
Merge pull request #62 from mfojtik/heat_tests

Do not raise exception when Heat credentials are not configured
Add heat sample config to docs.
Add username/pass to heat client
create stack if it does not exist
Merge pull request #66 from mtaylor/heat_creds

Heat creds
Merge pull request #65 from jguiditta/docs

Add heat sample config to docs.
Protects for cases where flavor already exists or already deleted in nova
Merge pull request #69 from marios/fix_nova_flavor_sync_issues

Protects for cases where flavor already exists or already deleted in nov...
Added GET /v1/data_centers/template to return the overcloud HEAT template

This is just for the template debugging.
Initial change to compute Heat template to create flavors with UserData script
Added check to Heat script if instance_type does not already exists
Merge pull request #71 from mfojtik/templates

Initial change of the 'compute' Heat template to support creating flavors in Nova
Fixed displaying 'unit' attribute for Rack capacities

NOTE: You **need** to re-run the the sample_data.py script.
Merge pull request #67 from mtaylor/create_stack

Create stack
Fixed tests to support 'unit' attribute for Rack capacity
Merge pull request #74 from mfojtik/capacity_unit

Fixed displaying 'unit' attribute for Rack capacities
Improved handling of Rack state

- Set to 'provisioning' when Heat stack is CREATE_IN_PROGRESS
  or UPDATE_IN_PROGRESS

- Set to 'active' when Heat stack is UPDATE_COMPLETE or CREATE_COMPLETE

- Set to 'error' when Heat stack is UPDATE_FAILED or CREATE_FAILED
Merge pull request #70 from mfojtik/rack_state

Improved handling of Rack state