Use from/import style in module report

Files in module report are using 'import openstack.common.*', not 'from
openstack.common import'. Though these two ways work well. But the first
one let update.py can't replace with base_name, see
https://github.com/openstack/oslo-incubator/blob/master/update.py#L163
Considering other modules are using oslo-incubator code in the second way,
to keep consistency, we'd better follow the last one.

Closes-Bug: #1304774

Change-Id: Ife98dc96b012d6aa7b5bd10d09a733506072fa1c
Improve help strings

Follow oslo.config style guide for help strings better to create
more consistent help strings:
* Capitalize first word of each help string
* Finish help strings with "."
* Improve wording, capitalization

Change-Id: Ia9698807430d8b6b0862dfb8a7f8874703a88ff1
jsonutils.load() accepts file pointer, not string

Renamed jsonutils.load() argument name to more appropriate one. This
name is also used in stdlib json documentation [1].

1: https://docs.python.org/2/library/json.html#json.load

Change-Id: Ia0cfce0e023ce29d3aad80a71039343643820bb4
Merge "Improve help strings"
Merge "jsonutils.load() accepts file pointer, not string"
Merge "Use from/import style in module report"