Pinned pyasn1 to 0.4.8. RE DBOARD3-722

This is for compatability with pysnmp

requirements.txt

 click
 mysql-connector
 pysnmp
-pyasn1
+pyasn1==0.4.8
 jsonschema
 paramiko
 flask

setup.py

@@ -12,7 +12,7 @@ setup(
     install_requires=[
         'click',
         'mysql-connector',
-        'pyasn1',
+        'pyasn1==0.4.8',
         'pysnmp',
         'jsonschema',
         'paramiko',