[swss]: Update to debian python-scapy (2.4.2) to fix scapy crash seen…

… with 2.3.3-1 (#2745)

* Fix scapy crash problem with pip scapy (2.4.2)

Signed-off-by: Jipan Yang <jipan.yang@alibaba-inc.com>

dockers/docker-orchagent/Dockerfile.j2

@@ -10,14 +10,15 @@ RUN apt-get update
 
 RUN apt-get install -f -y ifupdown arping libdbus-1-3 libdaemon0 libjansson4 libpython2.7 iproute2
 
-RUN apt-get install -f -y ndisc6 tcpdump python-scapy
+RUN apt-get install -f -y ndisc6 tcpdump
+RUN pip install scapy==2.4.2
 ## Install redis-tools dependencies
 ## TODO: implicitly install dependencies
 RUN apt-get -y install libjemalloc1
 
 RUN apt-get install -y libelf1 libmnl0 bridge-utils
 
-RUN pip install setuptools 
+RUN pip install setuptools
 RUN pip install pyroute2==0.5.3 netifaces==0.10.7
 RUN pip install monotonic==1.5