Get hostname from 'hostname' file

Will allow running from any computer even with "invalid" hostname.

Author: cladmi

gateway_code/board_config.py

@@ -22,7 +22,6 @@
 
 """ Board Config """
 
-import os
 import functools
 import gateway_code.config as config  # allow mocking as 'gateway_code.config'
 from gateway_code import profile
@@ -43,7 +42,7 @@ def __init__(self):
         self.cn_class = config.control_node_class(cn_type)
 
         self.robot_type = config.read_config('robot', None)
-        self.node_id = os.uname()[1]
+        self.node_id = config.read_config('hostname')
 
         self.profile_from_dict = functools.partial(profile.Profile.from_dict,
                                                    self.board_class)

gateway_code/tests/config/invalid_board_type/hostname

@@ -0,0 +1 @@
+invalid-00

gateway_code/tests/config/m3_no_robot/hostname

@@ -0,0 +1 @@
+m3-00

gateway_code/tests/config/m3_robot/hostname

@@ -0,0 +1 @@
+m3-00

gateway_code/tests/utils.py

@@ -34,6 +34,7 @@ def read_config_mock(board_type, **kwargs):
 
     config_dict = kwargs.copy()
     config_dict['board_type'] = board_type
+    config_dict.setdefault('hostname', '%s-00' % board_type)
 
     def read_config(key, default=IOError):
         """ read_config_mock """