Remove python-libpcap, add libpcap-dev to ansible.  Remove pypcap from the requirements file

Change-Id: Ic1c17975d2ea7bf4966634e317334136c6dffdde
diff --git a/ansible/roles/common/defaults/main.yml b/ansible/roles/common/defaults/main.yml
index 5ed426f..c97c39d 100644
--- a/ansible/roles/common/defaults/main.yml
+++ b/ansible/roles/common/defaults/main.yml
@@ -8,12 +8,13 @@
   - python-dev
   - libssl-dev
   - libffi-dev
+  - libpcap-dev
   - python-virtualenv
   - jq
   - python-nose
   - python-flake8
   - python-scapy
-  - python-libpcap
+#  - python-libpcap
 
 obsolete_services:
   - puppet