The return value of a package prerm script is discarded and not returned
correctly by default_prerm(). This allows other operations like service
shutdown to "leak" their return value, prompting workarounds like commit
48cfc826 which do not address the root cause.
Preserve a package prerm script return value for use by default_prerm(),
sharing the corresponding code from default_postinst() for consistency.
Also use consistent code for handling of /etc/init.d/ scripts.
Run Tested on: LEDE 17.01.4 running ar71xx.
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
Tony Ambardar