make modular plugins (distro-agnostic elivepatch)

[aliceinwire]

For making Elivepatch compatible with other distributions we need to move Gentoo specific part of the code into a plugin.
Would be useful also making Elivepatch work with other kinds of Linux sources.
Having Elivepatch made modularly will come also useful for making plugin for compile live patch on virtual machine or containers.

[aliceinwire]

for doing modular distro agnostic plugins we need compatibility with old version of kpatch.
for example:
kpatch version 0.3.2 on debian
kpatch version 0.5.0-0u1 on ubuntu

[aliceinwire]

we can add a --distro argument flag for try to compile for other distributions.

[aliceinwire]

Kpatch versions:
Debian Stable 0.3.2
Debian Testing 0.6.0
Kpatch in others distribution