[mgmt-framework]: support python3 in mgmt-framework (#6038)

Fix specific version for mmh3 for python2 and python3 and Add pyang for python3

Author: faraazbrcm

dockers/docker-sonic-mgmt-framework/Dockerfile.j2

@@ -7,15 +7,23 @@ RUN [ -f /etc/rsyslog.conf ] && sed -ri "s/%syslogtag%/$docker_container_name#%s
 ENV DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update && \
-    apt-get install -y g++ python-dev libxml2
-
-RUN pip install connexion==1.1.15 \
-		setuptools==21.0.0 \
-		grpcio-tools==1.20.0 \
-		certifi==2017.4.17 \
-		python-dateutil==2.6.0 \
-		six==1.11.0 \
-		urllib3==1.21.1
+    apt-get install -y g++ python-dev python3-dev libxml2
+
+RUN pip2 install connexion==1.1.15 \
+                setuptools==21.0.0 \
+                grpcio-tools==1.20.0 \
+                certifi==2017.4.17 \
+                python-dateutil==2.6.0 \
+                six==1.11.0 \
+                urllib3==1.21.1
+
+RUN pip3 install connexion==2.7.0 \
+                 setuptools==21.0.0 \
+                 grpcio-tools==1.20.0 \
+                 certifi==2017.4.17 \
+                 python-dateutil==2.6.0 \
+                 six==1.11.0 \
+                 urllib3==1.21.1
 
 COPY \
 {% for deb in docker_sonic_mgmt_framework_debs.split(' ') -%}
@@ -32,7 +40,7 @@ COPY ["start.sh", "rest-server.sh", "/usr/bin/"]
 COPY ["mgmt_vars.j2", "/usr/share/sonic/templates/"]
 COPY ["supervisord.conf", "/etc/supervisor/conf.d/"]
 
-RUN apt-get remove -y g++ python-dev
+RUN apt-get remove -y g++ python-dev python3-dev
 RUN apt-get clean -y; apt-get autoclean -y; apt-get autoremove -y
 RUN rm -rf /debs
 

sonic-slave-buster/Dockerfile.j2

@@ -431,7 +431,9 @@ RUN pip2 install pyang==2.1.1
 RUN pip3 install pyang==2.1.1
 
 # For mgmt-framework build
-RUN pip2 install mmh3
+RUN pip2 install mmh3==2.5.1
+RUN pip3 install mmh3==2.5.1
+
 RUN apt-get install -y xsltproc
 
 # Install dependencies for isc-dhcp-relay build