get rid of props_to_json function

to make iolist_to_binary calls explicit in order to allow the value of
the property to be list

Change-Id: I925e5b1732bdc8b0e0dabc05532b876ff32eeb58
Reviewed-on: http://review.couchbase.org/43218
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
allow undefined request in audit api

to support reset_password and potentially node shutdown which are not
initiated by http request

Change-Id: I2abab1aebc29af33b20bd7e9eb388ad89e0d8699
Reviewed-on: http://review.couchbase.org/43219
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
auditing the changes of credentials

Change-Id: I075be154d23735496ca6867758cd8cbbcea76ce9
Reviewed-on: http://review.couchbase.org/43220
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
auditing node operations

Change-Id: Ie5d38b57a0fcd2ac6841e956e2a18a319155751c
Reviewed-on: http://review.couchbase.org/43221
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>