Add unit testcases for sysMapFile().
Test: recovery_unit_test passes.
Test: Build and use the new recovery image to sideload a package.
Test: Build and use the new recovery image to install an update.
Change-Id: I77d8f1ea151ab513865d992c256ba93a1fcb51a4
(cherry picked from commit c3292f3fcb)
Clean up the duplicated codes that handle the zip files in
bootable/recovery; and rename the library of the remaining
utility functions to libotautil.
Test: Update package installed successfully on angler.
Bug: 19472796
Change-Id: Iea8962fcf3004473cb0322b6bb3a9ea3ca7f679e
Tao Bao
Tianjie Xu