Fix two issues after moving to unified logging system for command-line utils

Hi hackers,

I have found two minor issues with unified logging system for
command-line programs (commited by Peter cc8d415117), while was rebasing
my pg_rewind patch:

1) forgotten new-line symbol in pg_fatal call inside pg_rewind, which
will cause the following Assert in common/logging.c to fire

Assert(fmt[strlen(fmt) - 1] != '\n');

It seems not to be a problem for a production Postgres installation
without asserts, but should be removed for sanity.

2) swapped progname <-> full_path in initdb.c setup_bin_paths's call
[1]: https://github.com/postgres/postgres/commit/cc8d41511721d25d557fc02a46c053c0a602fed0#diff-c4414062a0071ec15df504d39a6df705R2500
rather misleading, since in the pg_ctl and pg_dumpall the previous order
is used.

Attached is a small patch that fixes these issues.

[1]: https://github.com/postgres/postgres/commit/cc8d41511721d25d557fc02a46c053c0a602fed0#diff-c4414062a0071ec15df504d39a6df705R2500
https://github.com/postgres/postgres/commit/cc8d41511721d25d557fc02a46c053c0a602fed0#diff-c4414062a0071ec15df504d39a6df705R2500

Regards

--
Alexey Kondratov

Postgres Professional https://www.postgrespro.com
Russian Postgres Company