Superuser 4.3 fixes.

Add support for su daemon to work around SELinux policies
and new capset on zygote/dalvik.

Change-Id: I2bdc7ef61dc17430a878e13dd098e6d0c004ddb2
Fix build

Change-Id: I2f65d0128ef0b885603caf1100a194626d04cbed
cleanups and sanity check string length

Change-Id: I17be8f06edd5ec507ab9b0a14cf305be75afc067
Add support for su daemon installation and detection in recovery zip.

Change-Id: I09f2d2be61c9e8c5dec755de05227d41e08e4de8