/etc/default/dovecot is in dovecot-core 1:2.2.13-12~deb8u4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | # /etc/default/dovecot
# Set to '0' to explicitly disable starting Dovecot
#ENABLED=0
# Set to '1' to allow Dovecot daemons to produce core dumps
#ALLOW_COREDUMPS=1
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