[utils] Added helper method to get free port from range

beat/core/utils.py

@@ -103,3 +103,17 @@ def find_free_port():
       socket.SOCK_STREAM)) as s:
         s.bind(('', 0))
         return s.getsockname()[1]
+
+
+def find_free_port_in_range(min_port, max_port):
+    '''Returns the value of a free port in range'''
+
+    for port in range(min_port, max_port):
+        with contextlib.closing(socket.socket(socket.AF_INET,
+            socket.SOCK_STREAM)) as sock:
+            try:
+                sock.bind(('', port))
+            except socket.error as e:
+                continue
+            else:
+                return sock.getsockname()[1]