[macOS] Get rid of invoke_tests imports (#2496)

* get rid of invoke_tests imports

* add sudo

* change path to /usr/bin/invoke_tests

* create /usr/local/bin dir

* remove local variables

* fix group owner

* set default 775 perm

* delete invoke_tests symlink

images/macos/provision/core/postgresql.sh

@@ -1,6 +1,5 @@
 #!/bin/bash -e -o pipefail
 source ~/utils/utils.sh
-source ~/utils/invoke-tests.sh
 
 #Install latest version of postgresql
 brew_smart_install "postgres"
@@ -27,4 +26,4 @@ done
 #Stop postgresql
 brew services stop postgresql
 
-invoke_tests "Databases" "PostgreSQL"
+invoke_tests "Databases" "PostgreSQL"