apparmor: allow default pki path
apparmor: allow default pki path

/etc/pki/qemu is a pki path recommended by qemu tls docs [1]
and one that can cause issues with spice connections when missing.

Add the path to the allowed list of pki paths to fix the issue.

Note: this is active in Debian/Ubuntu [1] for quite a while already.

[1]: https://www.qemu.org/docs/master/system/tls.html
[2]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=930100

Signed-off-by: Christian Ehrhardt <48da28e2c2cd455d60e19b14c46925e20a3c5d5b@canonical.com>
Reviewed-by: Andrea Bolognani <3ada0bee826c753786fdbba72243dfba997094cf@redhat.com>
Acked-by: Jamie Strandboge <b4dde37aa2aac745c0e6c43447507eaeace3e59f@canonical.com>

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