LAPI: support CRL files with multiple PEM blocks

[mmetc]

for #2991

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 28 lines in your changes are missing coverage. Please review.

Project coverage is 27.55%. Comparing base (e4a8d3b) to head (c14ec23).

Files	Patch %	Lines
pkg/apiserver/middlewares/v1/tls_auth.go	0.00%	28 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3002   +/-   ##
=======================================
  Coverage   27.54%   27.55%           
=======================================
  Files         398      398           
  Lines       57921    57920    -1     
=======================================
+ Hits        15956    15958    +2     
+ Misses      40027    40024    -3     
  Partials     1938     1938           

Flag	Coverage Δ
unit-linux	35.07% <0.00%> (+0.02%)	⬆️
unit-windows	25.58% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.