Increased power on timeout.

lib/boot/powerons.py
  - bmc_power_on:  I changed the timeout value from 7 mins to 14 mins.

Change-Id: I4859065c42bd5215eb95fd781a7c5177c12232c9
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
diff --git a/lib/boot/powerons.py b/lib/boot/powerons.py
index 872912a..a7a9ab1 100755
--- a/lib/boot/powerons.py
+++ b/lib/boot/powerons.py
@@ -55,6 +55,7 @@
     final_state = state_mod.anchor_state(final_state)
 
     grp.rprintn()
-    state_mod.wait_state(final_state, wait_time="7 min", interval="3 seconds")
+    state_mod.wait_state(final_state, wait_time="14 mins",
+                         interval="3 seconds")
 
 ###############################################################################