GODT-1356 GODT-1302: Cache on disk concurency and API retries

- GODT-1302: Change maximum resty retries from 0 to 30
- GODT-1302: Make sure we are closing GetAttachmen io.ReadCloser on error
- GODT-1356: Do not use attachmentPool - it was useless anyway
- GODT-1356: Increase cache watcher limit to 10min
- GODT-1356: Start cache watcher right after start (do not wait first 10 min)
- GODT-1356: Limit number of buildJobs (memory allocation) in BuildAndCacheMessage
- Other: Pass context from job options (message builder) to fetcher (both message and attachments)
- Other: BuildJob contains same function as returned buildDone (proper map locking)

pkg/pmapi/manager_test.go

@@ -34,6 +34,11 @@ const testForceUpgradeBody = `{
 	"Error":"Upgrade!"
 }`
 
+const testTooManyAPIRequests = `{
+	"Code":85131,
+	"Error":"Too many recent API requests"
+}`
+
 func TestHandleTooManyRequests(t *testing.T) {
 	var numCalls int
 
@@ -42,6 +47,8 @@ func TestHandleTooManyRequests(t *testing.T) {
 
 		if numCalls < 5 {
 			w.WriteHeader(http.StatusTooManyRequests)
+			w.Header().Set("content-type", "application/json;charset=utf-8")
+			fmt.Fprint(w, testTooManyAPIRequests)
 		} else {
 			w.WriteHeader(http.StatusOK)
 		}