Use smaller max_fan_speed in tests

This should allow iMacs to complete tests successfully.  Fixes #212.
Fixes #215.

Author: gaul

mbpfan.conf.test1

@@ -1,6 +1,6 @@
 [general]
-min_fan1_speed = 6200	# default is 2000
-max_fan1_speed = 6200	# default is 6200
+min_fan1_speed = 2000	# default is 2000
+max_fan1_speed = 2600	# default is 2600
 low_temp = 63			# try ranges 55-63, default is 63
 high_temp = 66			# try ranges 58-66, default is 66
 max_temp = 86			# do not set it > 90, default is 86

src/minunit.c

@@ -159,7 +159,8 @@ static const char *test_settings()
     fan->next = NULL;
 
     retrieve_settings("./mbpfan.conf.test1", fan);
-    mu_assert("max_fan_speed value is not 6200", fan->fan_max_speed == 6200);
+    // choosing the maximum for iMac mid 2011
+    mu_assert("max_fan_speed value is not 2600", fan->fan_max_speed == 2600);
     mu_assert("polling_interval is not 2", polling_interval == 2);
 
     fan->fan_min_speed = -1;