[Bug 120049] header_postinst_hook should use /etc/kernel/header_postinst.d instead

[Matt Domsch]

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The linux-image package has preinst and postinst scripts that let other packages hook in, by placing a script in /etc/kernel/preinst.d/ and /etc/kernel/postinst.d/.
The linux-headers package also has a way for other packages to hook in, but it requires editing /etc/kernel-img.conf and adding a header_postinst_hook=... line, which only allows for a single application to hook there.

Dell DKMS 2.0.17 will make use of the /etc/kernel/preinst.d/ and
postinst.d/ directories to be aware of linux-image package updates, but
it also needs to hook linux-headers postinst.  It would be nice for
linux-headers to have a similar directory mechanism, ala
/etc/kernel/header_preinst.d/ and header_postinst.d/, rather than
needing to edit /etc/kernel-img.conf.

** Affects: redfish (upstream)
     Importance: Undecided
         Status: New

** Affects: kernel-package (Ubuntu)
     Importance: Medium
     Assignee: Ubuntu Kernel Team
         Status: Triaged

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header_postinst_hook should use /etc/kernel/header_postinst.d instead
https://bugs.launchpad.net/bugs/120049