Add apt-packages, modify predeploy

Former-commit-id: a7c6fae

Author: xhlulu

apps/dash-synapse-demo/apt-packages

@@ -0,0 +1,2 @@
+unixodbc
+unixodbc-dev

apps/dash-synapse-demo/predeploy.sh

@@ -1,3 +1,7 @@
 curl https://packages.microsoft.com/ubuntu/18.04/prod/pool/main/m/msodbcsql17/msodbcsql17_17.3.1.1-1_amd64.deb --output msodbcsql17_17.3.1.1-1_amd64.deb
 
-ACCEPT_EULA=Y dpkg -i msodbcsql17_17.3.1.1-1_amd64.deb
+ACCEPT_EULA=Y dpkg -i msodbcsql17_17.3.1.1-1_amd64.deb
+
+if [ -f "predeploy.py" ]; then
+    python predeploy.py
+fi