test: Rewrite JWT cache tests

Timing dependent tests in the IO tests don't work too well when the next
commit increases the JWT parsing performance.

The remaining IO tests are for coverage and basic breakage. Loadtests
are adapted so that performance regressions for JWT caching would be
detected that way.

test/load/targets.http

@@ -1,10 +1,12 @@
 GET http://postgrest/
+Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.e30.CUIP5V9thWsGGFsFyGijSZf1fJMfarLHI9CEJL-TGNk
 Prefer: tx=commit
 
 HEAD http://postgrest/actors?actor=eq.1
 Prefer: tx=commit
 
 GET http://postgrest/actors?select=*,roles(*,films(*))
+Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.e30.CUIP5V9thWsGGFsFyGijSZf1fJMfarLHI9CEJL-TGNk
 Prefer: tx=commit
 
 POST http://postgrest/films?columns=id,title
@@ -12,6 +14,7 @@ Prefer: tx=rollback
 @post.json
 
 POST http://postgrest/films?columns=id,title,year,runtime,genres,director,actors,plot,posterUrl
+Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.e30.CUIP5V9thWsGGFsFyGijSZf1fJMfarLHI9CEJL-TGNk
 Prefer: tx=rollback
 # this bulk.json was obtained from https://github.com/erik-sytnyk/movies-list/blob/master/db.json
 @bulk.json
@@ -21,6 +24,7 @@ Prefer: tx=rollback
 @put.json
 
 PATCH http://postgrest/actors?actor=eq.1
+Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.e30.CUIP5V9thWsGGFsFyGijSZf1fJMfarLHI9CEJL-TGNk
 Prefer: tx=rollback
 @patch.json
 
@@ -28,8 +32,10 @@ DELETE http://postgrest/roles
 Prefer: tx=rollback
 
 GET http://postgrest/rpc/call_me?name=John
+Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.e30.CUIP5V9thWsGGFsFyGijSZf1fJMfarLHI9CEJL-TGNk
 
 POST http://postgrest/rpc/call_me
 @rpc.json
 
 OPTIONS http://postgrest/actors
+Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.e30.CUIP5V9thWsGGFsFyGijSZf1fJMfarLHI9CEJL-TGNk