Improve build time

The bcrypt hashing is really slow with enabled race condition checker,
therefore we exlcude it.

all-test-with-coverage.sh

@@ -4,9 +4,10 @@ set -e
 echo "" > coverage.txt
 
 for d in $(go list ./... | grep -v vendor); do
-    go test -v -race -coverprofile=profile.out -covermode=atomic $d
+    go test -v -coverprofile=profile.out -covermode=atomic $d
     if [ -f profile.out ]; then
         cat profile.out >> coverage.txt
         rm profile.out
     fi
 done
+go test -v -race ./...

auth/authentication_test.go

@@ -1,3 +1,5 @@
+// +build !race
+
 package auth
 
 import (

auth/password_test.go

@@ -1,3 +1,5 @@
+// +build !race
+
 package auth
 
 import (