Change daemon Pidfile class to not use root_helper

Some users of the Pidfile class don't specify root_helper,
which then defaults to 'sudo', which will generate an error.
Remove root_helper altogether since we actually don't need
root priveleges to read /proc/$pid/cmdline.

Changed code to use open.readline() instead of a shell, and
tweaked tests accordingly.

Also cleaned-up the rootwrap filters that allow it as they
are not used anymore.

Fixes bug 1218142

Change-Id: I6691feb1c9f7bfa261a7ec464fd8f3f92168c302
Do not apply security groups to logical ports

Security groups rules were applied to logical ports and this caused
Floating IP not to work correctly.
Correct some typo.

Change-Id: I174e60f8eb8a4d00b71fffc127e2d2d36836835d
Closes-Bug: #1221336
Fix handling of floating IP association info in Nicira plugin

Bug 1223902

This patch fixes the _update_fix_assoc routine in the Nicira plugin,
ensuring the association of a floating IP with a router is removed
when the floating IP is disassociated.
This patch also adds a unit test for validating behaviour when a floating
IP is associated to a port on a different router, which was an
uncovered use case. This new unit test required some refactoring in
test_l3_plugin.py.

Change-Id: Ibfd53a637f4d14a368b0aeff289c15f993df58dd
Fix ovs-vsctl call in add_tunnel_port()

When a new GRE tunnel is created OVS agent calls ovs-vsctl
incorrectly. Command:

    sudo ovs-vsctl --timeout=2 --may-exist add-port br-tun gre-1

is produced instead of correct one:

   sudo ovs-vsctl --timeout=2 -- --may-exist add-port br-tun gre-1

Fixes bug 1227675

Change-Id: I010961658a37028e41621c4a529b5a14e7587c7f
Cisco plugin portbinding extension support

This commit adds portbinding extension support to the Cisco plugin.

Change-Id: I87554607860b040b693edeecc2706ca8edbe49b6
Fixes: Bug #1218033
Change header from LLC to Foundation

Change-Id: I11d7e734ae56568f2387a208efe0d1487377cbf9
Closes-Bug: #1214176
Merge "Cisco plugin portbinding extension support"
Merge "Change header from LLC to Foundation"
Merge "Fix ovs-vsctl call in add_tunnel_port()"
Merge "Fix handling of floating IP association info in Nicira plugin"
Merge "Do not apply security groups to logical ports"
Merge "Change daemon Pidfile class to not use root_helper"