Show waiting for boot failure when boot actually fails.

Before when "Waiting for AVD(s) to boot up ..." message would show OK
regardless if the AVD successfully booted up or not. Not we show fail if
the boot times out.

Bug: 120613478
Test: acloud create with fake induced timeout
Change-Id: Ieaa00b4974bf9ad755de7ccf3ca3e7b8494231d5
2 files changed