I don't see any apparmor denials in your kern.log and this line is in your 
apparmor profile:
/{,var/}run/{,dhcp-server/}dhcpd{,6}.pid w,

which allows writes to:
/var/run/dhcpd.pid

This does not seem to be an apparmor problem.

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https://bugs.launchpad.net/bugs/985417

Title:
  dhcpd cannot write  /var/run/dhcpd.pid

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