Increase default watchdog timeout to 10 minutes

We have discovered some error cases within the memory diagnostics
step where a single hardware operation can take up to 6 minutes
to complete.  The code sends a watchdog ping before issuing any
command, but the current timeout (2 minutes) is insufficient to
handle these long commands.

Resolves boston-openpower/#1240

Change-Id: I4e27a45c927c014b5fcc28d4510c5996a7009953
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/59290
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

src/include/usr/ipmi/ipmiwatchdog.H

@@ -43,7 +43,7 @@ namespace IPMIWATCHDOG
 // Globals/Constants
 /******************************************************************************/
 /**
- * @brief the default watchdog countdown setting it to 120 seconds.
+ * @brief the default watchdog countdown setting it to 600 seconds.
  *
  */
 // The config option CONFIG_BMC_IPMI_LONG_WATCHDOG allows a tester to use a
@@ -53,7 +53,7 @@ namespace IPMIWATCHDOG
 #ifdef CONFIG_BMC_IPMI_LONG_WATCHDOG
 const uint16_t  DEFAULT_WATCHDOG_COUNTDOWN = 3600; //60 minutes
 #else
-const uint16_t  DEFAULT_WATCHDOG_COUNTDOWN = 120; //2 minutes
+const uint16_t  DEFAULT_WATCHDOG_COUNTDOWN = 600; //10 minutes
 #endif
 
 /**