Thomas VIAL 69d3bac45e Add bats asserts (#463) ...

* Added `bats-assert` for more detailed error, very useful locally and on Travis
* Moved `bats` to git submodule

Example:

```
not ok 52 checking opendkim: generator creates keys, tables and TrustedHosts
# (from function `assert_output' in file test/test_helper/bats-assert/src/assert.bash, line 239,
#  in test file test/tests.bats, line 368)
#   `assert_output 2' failed
# 
# -- output differs --
# expected : 2
# actual   : 4
# --
# 
```

2017-01-10 14:15:41 +01:00

..

bats-assert @ 9f88b4207d

Add bats asserts (#463)

2017-01-10 14:15:41 +01:00

bats-support @ 004e707638

Add bats asserts (#463)

2017-01-10 14:15:41 +01:00