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

Change-Id: Ic1c17975d2ea7bf4966634e317334136c6dffdde
diff --git a/requirements.txt b/requirements.txt
index 1c99294..6e785bd 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@
 protobuf-to-dict>=0.1.0
 pyflakes>=1.0.0
 pylint>=1.5.2
-pypcap>=1.1.5
+#pypcap>=1.1.5
 pyOpenSSL>=0.13
 PyYAML>=3.10
 requests