Support LTE emulation on OpenNet

* This commit includes an NS-3 patch for LTE emulation on OpenNet
* Major modules:
  - tap-epc-helper: an epc-helper which can integrate emulation of
                    NS-3 LTE and Open vSwitch, also support
                    distributed emulation.
  - lte-time-dilation-factor: a module which can control ratio
                              between real time and virtual time,
                              used to enlarge emulation scale.
  - tap-epc-enb-application: new epc-enb-application, designed for
                             OpenNet emulation.

Author: kansokusha

ansible/roles/ns3/tasks/main.yml

@@ -22,6 +22,7 @@
     - animation-interface.patch
     - netanim-python.patch
     - sta-wifi-scan.patch
+    - lte.patch
   tags: ns3
 - name: Waf configure
   command: "./waf configure"
@@ -34,6 +35,7 @@
   with_items:
     - netanim
     - wifi
+    - lte
   args:
     chdir: "{{ home_location }}/ns-allinone-{{ NS3_VERSION }}/ns-{{ NS3_VERSION }}"
   async: 0