Add 'install-example-configs' make target, addreses BIT-1089.

Building this target will force installation of example versions of all
config files (same install path as actual config file, but file suffix
is ".example").
Merge remote-tracking branch 'origin/topic/jsiwek/example-configs'

* origin/topic/jsiwek/example-configs:
  Add 'install-example-configs' make target, addreses BIT-1089.