Require pynetsnmp-2>=0.1.10

Version 0.1.10 contains bugfixes that are crucial for SNMPv3 support.

This also removes the upper bounds of the version number, as we control
the pynetsnmp-2 dependency anyway.

requirements/base.txt

@@ -29,7 +29,7 @@ crispy-forms-foundation>=0.7,<0.8
 # REST framework
 iso8601
 
-pynetsnmp-2>=0.1.8,<0.2.0
+pynetsnmp-2>=0.1.10
 
 # libsass for compiling scss files to css using distutils/setuptools
 libsass==0.15.1