Correct uses of :params in docstrings

Replace all occurrences of :params with :param alongway
(matches http://sphinx-doc.org/domains.html#info-field-lists)

Change-Id: Ia01e563dd54cce1e763c076b15d1a47b790eb802
Change log from ERROR to WARNING when instance absent

Periodic task will update the host stat so that it will
collect all active instances and get their disk size
during the operation period, the instance might be resized
by nova operations, it will lead to disk file not exist
it's not an error from current design point of view, so
change from ERROR to WARNING to avoid confusion

Change-Id: I3b6f1416c248d9d4d2caaf2cc30a7c944685661c
Closes-Bug: #1243849
Rename instance_type to flavor in hyper-v virt driver

Renames 'instance_type' to 'flavor' in the hyper-v virt driver and
associated tests.

Part of blueprint flavor-instance-type-dedup

Change-Id: I769bf86a63283152c5bbc5644e7b74cc2bb24697
Add finer granularity to host aggregate APIs

This change provides the ability to set finer permission rules around
the host aggregate APIs. Prior to this change, all operations assumed
that the same permissions were necessary. However, it's very possible
that an OpenStack administrator may want to have varying sets of
permissions for operations across the standard CRUD operations.  This
change is only applicable to the v3 APIs as v2 APIs should remain
backwards compatible.

Also included is a change to fake_policy.py (since the file was
updated anyway) to make the base aggregate policy require the
'admin_api' rule (i.e., to be consistent with the policy.json file).

Also added the corresponding API test cases.

DocImpact v3 host aggregate APIs require action-level policies
Implements: blueprint aggregate-api-policy

Change-Id: I8a88824bbb41807fad849ad15af4411d3a3dca6e
Enabled Libvirt driver to read 'os_command_line' from image properties.

The os_command_line can now be presented to the Libvirt driver through the
glance image property 'os_command_line'.  When this property is present,
the driver uses its value instead of the default. Libvirt uses this
value as either kernel command line or arguments to init (in case of LXC).
DocImpact

bp: enable-libvirt-driver-to-read-kernel-command-line-from-glance-image
Change-Id: Iad53c687053bdb5469baad4331ea55f428c170b0
Merge "Add finer granularity to host aggregate APIs"
Merge "Enabled Libvirt driver to read 'os_command_line' from image properties."
Merge "Correct uses of :params in docstrings"
Merge "Change log from ERROR to WARNING when instance absent"
Merge "Rename instance_type to flavor in hyper-v virt driver"