Renewing the client token should update the internal auth state

[greglook]

This fixes the log/vault spam issue with periodic tokens and app-role services.

[codecov-io]

Codecov Report

Merging #26 into develop will decrease coverage by 0.28%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop      #26      +/-   ##
===========================================
- Coverage    27.46%   27.17%   -0.29%     
===========================================
  Files            6        6              
  Lines          579      585       +6     
  Branches        17       17              
===========================================
  Hits           159      159              
- Misses         403      409       +6     
  Partials        17       17

Impacted Files	Coverage Δ
src/vault/core.clj	75% <ø> (ø)	⬆️
src/vault/client/http.clj	19.4% <0%> (-0.36%)	⬇️

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[pyncc]

Nice, thank you!