Do not print exception and stack trace.

When upgrading a device from P build to Q build, since mInstanceId,
majorVersion, minorVersion are newly added fields in Q build, P version
XML file does not have this fields and Q build will get
java.net.ProtocolException and these newly fields are assigned default
value. This is normal during upgrade process. There is no need to
printout the exception and stack trace because that would confuse
people.

Bug: 127451110
Test: NA.
Change-Id: I0fb38a68d7f049b7f417c9ca444db61c4e5c3657