software/slapos-testing: remove redundant eggs

These must be installed through dependencies

software/slapos-testing/software.cfg

@@ -143,8 +143,6 @@ eggs +=
   ${python-cryptography:egg}
   ${pycurl:egg}
   ${bcrypt:egg}
-  dnspython
-  Jinja2
   ${kedifa-setup:egg}
   ${caucase-setup:egg}
   ${erp5.util-setup:egg}
@@ -162,7 +160,6 @@ eggs +=
   ${statsmodels:egg}
   ${scipy:egg}
   zope.testing
-  supervisor
   ${extra-eggs:eggs}
 
 [eggs/scripts]