Update RootCloak against RootBeer checks

[prattpratt]

• Remove tool-checker library hook as it cause crash.
• Add hook for RootBeerNative.checkForRoot() native method.
• Add hook for exec 'getprop' command.
• Update hook for SystemProperties.get("ro.build.selinux").

[rowandh]

RootBeer also exposes a few public methods, which some apps call directly instead of using RootBeerNative.checkForRoot().

Using this PR as a basis, I added some hooks to override these methods in rowandh@28ae8f9

I'll submit a new PR with these additions.

[bluee]

Examples of these checks are:

        RootBeer rootBeer = new RootBeer(this);
        boolean checkForBinary = rootBeer.checkForBinary("su");
        boolean checkForDangerousProps = rootBeer.checkForDangerousProps();
        boolean checkForRWPaths = rootBeer.checkForRWPaths();
        boolean detectTestKeys = rootBeer.detectTestKeys();
        boolean checkSuExists = rootBeer.checkSuExists();
        boolean checkForRootNative = rootBeer.checkForRootNative();