Split kt-secrets into kt-tls and kt-monitor

[gdbelvin]

• Move Monitor key to it's own secret
• Move the TLS keys to a TLS secret

By moving the TLS certs into a proper kubernets tls secret, it can be read by an ingress object in the future.

[codecov]

Codecov Report

Merging #1444 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1444      +/-   ##
==========================================
- Coverage   66.49%   66.44%   -0.05%     
==========================================
  Files          54       54              
  Lines        4026     4026              
==========================================
- Hits         2677     2675       -2     
- Misses        958      959       +1     
- Partials      391      392       +1

Impacted Files	Coverage Δ
core/sequencer/trillian_client.go	58.57% <0%> (-4.29%)	⬇️
core/sequencer/server.go	72.96% <0%> (-0.66%)	⬇️
impl/sql/directory/storage.go	69.17% <0%> (ø)	⬆️
core/keyserver/revisions.go	64.62% <0%> (+2.04%)	⬆️

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