Extra newline in SSL section of rabbitmq.config

[trefzer]

commit 8e97331 added a newline in
the ssl configuration of rabbitmqadmin.
with the empty line in the config, the following errors occur in the log when trying to download rabbitmqadmin.

=ERROR REPORT==== 14-Sep-2017::11:25:51 ===
application: mochiweb
"Accept failed error"
"{error,{options,{keyfile,"blah_privkey.pem",\n {error,eacces}}}}"

Rabitmq Version: 3.6.5, on CentOs 7.3

[wyardley]

@trefzer I noticed this when testing #632 and updated it (it was initially a single commit, but I squashed it into some bigger changes; if I had realized a bug, probably would have left it separate to make it more obvious).
So the changeset in
d66d0d8 should fix this.
We'll be cutting 7.0.0 soon.