[pgpool-committers: 7576] pgpool: Improve sample scripts.

[Bo Peng]

Improve sample scripts.
- Empty pg_replslot directory of the standby node after running pg_rewind, because pg_replslot directory may be copied from the primary node in old PostgreSQL versions.
- While creating/dropping replication slot, access remote database using psql instead of uing ssh.

Branch
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master

Details
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https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=832274d0c16743a84c89855dfbd82bb168e5b232

Modified Files
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src/sample/scripts/failover.sh.sample         | 21 ++++++++---------
src/sample/scripts/follow_primary.sh.sample   | 33 +++++++++++++++++++--------
src/sample/scripts/pgpool_remote_start.sample |  4 ++--
src/sample/scripts/recovery_1st_stage.sample  | 20 ++++++++++------
4 files changed, 48 insertions(+), 30 deletions(-)