Make local copy of client hostnames in backend status array.

The other strings, application_name and query string, were snapshotted to
local memory in pgstat_read_current_status(), but we forgot to do that for
client hostnames. As a result, the client hostname would appear to change in
the local copy, if the client disconnected.

Backpatch to all supported versions.

Author: Edmund Horner
Reviewed-by: Michael Paquier
Discussion: 
https://www.postgresql.org/message-id/CAMyN-kA7aOJzBmrYFdXcc7Z0NmW%2B5jBaf_m%3D_-77uRNyKC9r%3DA%40mail.gmail.com

Branch
------
REL9_4_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/310d1379dd710322da398f5223051368fc876e23

Modified Files
--------------
src/backend/postmaster/pgstat.c | 7 +++++++
1 file changed, 7 insertions(+)

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