pgsql: Optionally don't error out due to preexisting slots in commandli

Optionally don't error out due to preexisting slots in commandline utilities.

pg_receivexlog and pg_recvlogical error out when --create-slot is
specified and a slot with the same name already exists. In some cases,
especially with pg_receivexlog, that's rather annoying and requires
additional scripting.

Backpatch to 9.5 as slot control functions have newly been added to
pg_receivexlog, and there doesn't seem much point leaving it in a less
useful state.

Discussion: 20150619144755.GG29350@alap3.anarazel.de

Branch
------
REL9_5_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/0e8e48b0da6ea00f3dbcb659542b0c81a97d1253

Modified Files
--------------
doc/src/sgml/ref/pg_receivexlog.sgml | 10 ++++++++
doc/src/sgml/ref/pg_recvlogical.sgml | 10 ++++++++
src/bin/pg_basebackup/pg_receivexlog.c | 11 ++++++--
src/bin/pg_basebackup/pg_recvlogical.c | 9 ++++++-
src/bin/pg_basebackup/streamutil.c | 44 ++++++++++++++------------------
src/bin/pg_basebackup/streamutil.h | 4 +--
6 files changed, 58 insertions(+), 30 deletions(-)

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