Fix misspellings in horizon

Fix misspellings detected by:
* pip install misspellings
* git ls-files | grep -v locale | misspellings -f -

Change-Id: Icf49804b0113d9cba9a807e4ee343d8714571776
Closes-Bug: #1257295
Display trove instance hostname if available

Trove can now be integrated with designate, the instance will
have a hostname instead of ip. If the integration is not enabled
the ip would be available in the instance info.

Change-Id: I7173f4437e78dd45f8f99d5c9dd80ab86869e943
Closes-Bug: #1262777
Updating tutorial doc for dashboard loading

Changing tutorial to use the newer method for loading dashboards.

The tutorial needs a new revision in general, but that is beyond
the scope of this change.

Closes-bug: #1277325
Change-Id: Ie197b5ad9aafa125235a839fbcc7cd95e352e96a
Allows the user to modify an object

Now the user has an option to update an existent object. If
a file is provided, the object's file will be updated. But if
the file is not provided, the object's file will not be
updated.

Change-Id: I67752c7881b0e6b4ab20b13cca94b24d292736d5
Implements: blueprint modify-object
Merge "Display trove instance hostname if available"
Merge "Updating tutorial doc for dashboard loading"
Merge "Allows the user to modify an object"
Merge "Fix misspellings in horizon"