* Use const reference parameter type to avoid unnecessary copy.
* Use more efficient overloaded string methods.
Bug: 30407689
Bug: 30411878
Change-Id: Iefab05c077367f272abf545036b853e8a295c8cd
Test: build with WITH_TIDY=1
When I/O error happens, reboot and retry installation two times
before we abort this OTA update.
Bug: 25633753
Change-Id: Iba6d4203a343a725aa625a41d237606980d62f69