allow avoiding autocommits

by default, etckeeper will be configured so that auto commits are on (etckeeper
default).  if avoid_autocommits is true, etckeeper will be configured to avoid
autocommits (daily or before package manager runs).

defaults/main.yml

@@ -0,0 +1,2 @@
+---
+avoid_autocommits: false

templates/etckeeper.conf.j2

@@ -18,7 +18,7 @@ DARCS_COMMIT_OPTIONS="-a"
 
 # Uncomment to avoid etckeeper committing existing changes
 # to /etc automatically once per day.
-#AVOID_DAILY_AUTOCOMMITS=1
+AVOID_DAILY_AUTOCOMMITS={{ '1' if avoid_autocommits else '0' }}
 
 # Uncomment the following to avoid special file warning
 # (the option is enabled automatically by cronjob regardless).
@@ -27,7 +27,7 @@ DARCS_COMMIT_OPTIONS="-a"
 # Uncomment to avoid etckeeper committing existing changes to
 # /etc before installation. It will cancel the installation,
 # so you can commit the changes by hand.
-#AVOID_COMMIT_BEFORE_INSTALL=1
+AVOID_COMMIT_BEFORE_INSTALL={{ '1' if avoid_autocommits else '0' }}
 
 # The high-level package manager that's being used.
 # (apt, pacman-g2, yum, dnf, zypper etc)