Configurable OTA Safe Mode (#1393)

tests/test1.yaml

@@ -154,6 +154,8 @@ ota:
   safe_mode: True
   password: 'superlongpasswordthatnoonewillknow'
   port: 3286
+  reboot_timeout: 2min
+  num_attempts: 5
 
 logger:
   baud_rate: 0

tests/test2.yaml

@@ -40,6 +40,7 @@ uart:
 ota:
   safe_mode: True
   port: 3286
+  num_attempts: 15
 
 logger:
   level: DEBUG

tests/test3.yaml

@@ -204,6 +204,7 @@ uart:
 ota:
   safe_mode: True
   port: 3286
+  reboot_timeout: 15min
 
 logger:
   hardware_uart: UART1