Refactoring the loadbalancing view classes

In several view classes, there's overloaded functions that do nothing but
calling the overloaded function and returning the results. Removed theses
functions.

Change-Id: I595b978fb7e9da867bd7a4d66dd07e9eaec9e7b4
Closes-Bug: #1265619
Update to the latest version of the jquery tablesorter plugin.

This fixes a longstanding bug where IP addresses were sometimes sorted
incorrectly.

Change-Id: I606a13824dbd1ed7ee313c7f15a1ea21b67f1d19
Whitelist external netaddr requirement

* tox.ini(testenv.install_command): Use the --allow-external and
--allow-insecure options so that pip 1.5 and later will assent to
retrieve the netaddr package even though it's not hosted on PyPI.
The --allow-insecure option is aliased to a clearer
--allow-unverified wording in 1.5, but the old form is being used to
avoid breaking users of 1.4.x and will be valid at least through
1.6.x according to comments in the pip source.

Change-Id: I291684fa65279f0cb86f84e0d8e69bfa4b4087c0
Partial-Bug: #1266513
Fix charts display in Resource Usage

    Due to an error in a patch, the line 638 of horizon.d3linechart.js
has been commented. The consequence of this is that now charts are not
displayed in the Resource usage panel.

Fixes bug #1266505

Change-Id: Ifc9aa6100efdba6c3efd1ea47638a7934f457913
Merge "Whitelist external netaddr requirement"
Merge "Update to the latest version of the jquery tablesorter plugin."
Merge "Fix charts display in Resource Usage"
Merge "Refactoring the loadbalancing view classes"