Kernel module signing on Ubuntu 16.04

[miguelpdl]

It has been confirmed that the build works on a Debian 8 environment.

And in a round about way it builds on Ubuntu 16.04 too (v4.4 kernel). Most things seems to run fine until an error at the end.

INSTALL /home/kodacall/src/irati/stack/plugins/red/red-plugin.ko
At main.c:222:
- SSL error:02001002:system library:fopen:No such file or directory: bss_file.c:175
- SSL error:2006D080:BIO routines:BIO_new_file:no such file: bss_file.c:178
sign-file: certs/signing_key.pem: No such file or directory
  DEPMOD  4.4.0-93-generic

It's an error so as far as I can tell it does not break the build, but it certainly doesn't look right.

Investigating this issue it appears to be caused by a new and stricter method of kernel module signing on Ubuntu 16.04. More can be read here about Ubuntu 16.04, make install leads to ssl error.

The IRATI Stack should consider DKMS installation as being the recommended way on Ubuntu and should cover for this in the Stack build and install.