Don't trap exits in couch_file

It turns out to be impossible to trap the exit message from the parent
process in a gen_server, which is the only reason couch_file traps
exits in the first place (i.e, this has never worked).

This commit also changes the hot upgrade code to handle this
transition (but not the previous one).

COUCHDB-3259
1 file changed
tree: bc3a7549fd3f56538231e00c9939d6b1cb353c71
  1. include/
  2. priv/
  3. src/
  4. test/
  5. .gitignore
  6. .travis.yml
  7. LICENSE
  8. rebar.config.script