Revert the bump to beta for the android builders now that 1.15.0
is in stable release.
Generalize the cargo tarball name mangling to use a regular
expression to hand the tiny revision added for the stable
release, as suggested by mshal in bug 1332759.
MozReview-Commit-ID: 2xZWpvKxY77
Bump the Android builders to the latest beta release to reduce
the variance when we update Firefox 53 to 1.15.0 stable early
in the Aurora phase.
Android builds were moved to 1.15 early to address a code generation
issue with devices without neon.
Work around an issue with tarball naming in the cargo packages.
MozReview-Commit-ID: KQfkWmXV9hQ
Use sha256sum from coreutils instead of shasum to verify
rust releases when not running on MacOS. This makes the
repack script more portable between MacOS and Linux.
MozReview-Commit-ID: BxFDquTVklu
