Check resolvers in enrollTYPE policy

[cornelinux]

When enrolling different token types the policies can
now differentiate according to resolvers.

Closes #1646

[codecov]

Codecov Report

Merging #1647 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1647      +/-   ##
==========================================
+ Coverage   96.93%   96.94%   +<.01%     
==========================================
  Files         148      148              
  Lines       17741    17748       +7     
==========================================
+ Hits        17198    17205       +7     
  Misses        543      543

Impacted Files	Coverage Δ
privacyidea/api/lib/prepolicy.py	97.06% <100%> (+0.03%)	⬆️

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