When retrieving data from a vault using `out` to store the data in a
file resulted is random characters being returned and logged. These
characters could generate a traceback print from Ansible's logger,
without breaking the script.
The reason for that is that the result from `vault_retrive` was being
processed when it was not needed, and data was beeing returned, when
it shouldn't.
This patch fixes this behavior by supressing the return data when `data`
is not available, and only raising an error if it should be available.
The ipavault module was returning a single string value when retrieving
data. To keep consistency with other modules, it should return a dict
with the `data` variable in it.
This change modifies the result of ipavault to be a dict and also fixes
relevant tests, examples and documentation.
This change split vault tests in several files, organized by vault
type and operation (vault vs. member) so that it is easier to add
new tests for issues and verify if tests are missing.
