fixing issue #259 virtualenv zipp error

scripts/clmc-service/install-clmc-service.sh

@@ -30,6 +30,7 @@ apt-get install libssl-dev -y
 echo "----> Installing Python3, Pip3 and curl"
 apt-get install -y python3 python3-pip curl jq
 update-alternatives --install /usr/bin/python python /usr/bin/python3 10
+pip3 install --upgrade pip
 
 echo "----> Installing virtualenv and wrapper"
 pip3 install virtualenv

src/test/clmctest/services/pytest/install.sh

@@ -26,6 +26,7 @@
 apt-get update -o Acquire::CompressionTypes::Order::=gz
 apt-get -y install python3 python3-pip python-influxdb  
 update-alternatives --install /usr/bin/python python /usr/bin/python3 10
+pip3 install --upgrade pip
 
 pip3 install pytest pyyaml schema
 pip3 install --upgrade influxdb