Install libipfix-dev dependency

[nlewo]

I encountered the following error at contrail build time: 2015-09-29 19:53:30 g++ -o build/production/analytics/viz_collector.o -c -g -O3 -Wall -Werror -Wsign-compare -Wno-unused-local-typedefs -DLINUX -Icontroller/src -Ibuild/include -Icontroller/lib -I/usr/include/python2.7 -I/usr/include/librdkafka -Ibuild/production/tools/sandesh/library/common -Itools/sandesh/library/common -Ibuild/production/io -Icontroller/src/io -Ibuild/production -Icontroller/src/gendb -Ibuild/include/thrift -Ibuild/production/http/client -Icontroller/src/http/client -Ibuild/production/discovery/client -Icontroller/src/discovery/client -Ibuild/production/gendb -Icontroller/src/gendb -Ibuild/production/cdb -Icontroller/src/cdb -Ibuild/production/analytics -Icontroller/src/analytics -Ibuild/production -Ibuild/production/base/sandesh -Icontroller/src/base/sandesh controller/src/analytics/viz_collector.cc 2015-09-29 19:53:31 In file included from controller/src/analytics/viz_collector.cc:22:0: 2015-09-29 19:53:31 controller/src/analytics/ipfix_collector.h:12:19: fatal error: ipfix.h: No such file or directory 2015-09-29 19:53:31 #include "ipfix.h" 2015-09-29 19:53:31 ^ 2015-09-29 19:53:31 compilation terminated. 2015-09-29 19:53:35 scons: *** [build/production/analytics/viz_collector.o] Error 1 2015-09-29 19:53:35 scons: building terminated because of errors.

I then add this dependency somewhere in contrail.sh but not sure it's the right place...