[SHIBUI-1062]

Added /api/admin/users/role/{rolename} to get all users with a specific
role.

backend/src/main/java/edu/internet2/tier/shibboleth/admin/ui/security/controller/UsersController.java

@@ -60,6 +60,12 @@ public ResponseEntity<?> getOne(@PathVariable String username) {
         return ResponseEntity.ok(findUserOrThrowHttp404(username));
     }
 
+    @Transactional
+    @GetMapping("/role/{rolename}")
+    public ResponseEntity<?> getUsersWithRole(@PathVariable String rolename) {
+        return ResponseEntity.ok(userRepository.findByRoles_Name(rolename));
+    }
+
     @Transactional
     @DeleteMapping("/{username}")
     public ResponseEntity<?> deleteOne(@PathVariable String username) {