package.conf.d should be under /var, not /usr

fhs-2.3 says:

/usr is the second major section of the filesystem. /usr is shareable,
read-only data. That means that /usr should be shareable between various
FHS-compliant hosts and must not be written to. Any information that is
host-specific or varies with time is stored elsewhere.

package.conf.d is not shareable, as different machines may have different packages installed, so we should put it under /var instead.

Edited Mar 10, 2019 by Thomas Miedema

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package.conf.d should be under /var, not /usr