fix server pagination

[fastrde]

See #163 for details. Don't merge without further investigation! It's the example how i solved this for my usecase.

[codecov[bot]]

Codecov Report

Merging #171 into master will decrease coverage by 2.70%. The diff coverage is 78.26%.

@@            Coverage Diff             @@
##           master     #171      +/-   ##
==========================================
- Coverage   93.35%   90.64%   -2.71%     
==========================================
  Files          72       72              
  Lines        9914     9898      -16     
  Branches      972      974       +2     
==========================================
- Hits         9255     8972     -283     
- Misses        537      802     +265     
- Partials      122      124       +2     

Impacted Files	Coverage Δ
ldaptor/protocols/ldap/proxybase.py	45.89% <50.00%> (-13.17%)	:arrow_down:
ldaptor/testutil.py	85.84% <50.00%> (-6.61%)	:arrow_down:
ldaptor/protocols/ldap/ldapserver.py	80.90% <77.77%> (+0.45%)	:arrow_up:
ldaptor/protocols/ldap/ldapclient.py	89.20% <100.00%> (-2.58%)	:arrow_down:
ldaptor/protocols/ldap/ldapsyntax.py	85.05% <100.00%> (-8.00%)	:arrow_down:
ldaptor/protocols/ldap/merger.py	73.72% <100.00%> (-12.72%)	:arrow_down:
ldaptor/protocols/ldap/proxy.py	83.33% <100.00%> (ø)
ldaptor/test/test_ldapclient.py	95.45% <100.00%> (-4.55%)	:arrow_down:
ldaptor/numberalloc.py	51.35% <0.00%> (-43.25%)	:arrow_down:
ldaptor/protocols/ldap/svcbindproxy.py	38.96% <0.00%> (-36.37%)	:arrow_down:
... and 16 more

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