Increase the default poll duration for Cisco n1kv

Increase the poll duration for Cisco N1Kv, from 10s to 60s and also
clean up the /etc/neutron/plugins/cisco/cisco_plugins.ini file. The
current poll duration of 10s causes that VSM to unnecessarily taking
frequent CPU cycles, resulting in the failure of other tasks in scale
configurations.

Closes-Bug: 1357030

Change-Id: I95747f35bae5b7157391c1698c0fe84d2126aa10
Predictable iptables chains output order

This fixes the iptables unit tests that break with a randomized PYTHONHASHSEED
(see the bug report).

The chains for iptables are stored as sets to avoid duplicates. When they are
output by iptables_manager their order can therefore be unpredictable. This was
found hash seed 1016732220.

To fix this we:
 - Sort the chains output by iptables_manager
 - Update the unit tests to check for sorted chains

When multiple tables are processed, they can be processed in any order or
dumped in any order. Found with hash seed 3728666619.

To fix this we:
 - Traverse the tables in sorted order for dumping
 - Fix tests to allow for tables to be processed in any order

Note: There are several other unrelated unit tests that also break with a
randomized PYTHONHASHSEED, but they are not addressed here. They will be
addressed in separate patches.

Partial-bug: #1348818

Change-Id: Ic3f4cd85316c9fc2e78bc7f5e900cfac87baf39d
Merge "Predictable iptables chains output order"
Merge "Increase the default poll duration for Cisco n1kv"