Audit config, seams for enterprise audit features

allow oss to parse sink duration

clean up audit sink parsing

ent eventer config reload

fix typo

SetEnabled to eventer interface

client acl test

rm dead code

fix failing test

command/agent/testdata/basic.hcl

@@ -142,6 +142,27 @@ acl {
   replication_token = "foobar"
 }
 
+audit {
+  enabled = true
+
+  sink "file" {
+    type               = "file"
+    delivery_guarantee = "enforced"
+    format             = "json"
+    path               = "/opt/nomad/audit.log"
+    rotate_bytes       = 100
+    rotate_duration    = "24h"
+    rotate_max_files   = 10
+  }
+
+  filter "default" {
+    type       = "HTTPEvent"
+    endpoints  = ["/ui/", "/v1/agent/health"]
+    stages     = ["*"]
+    operations = ["*"]
+  }
+}
+
 telemetry {
   statsite_address             = "127.0.0.1:1234"
   statsd_address               = "127.0.0.1:2345"