[pgpool-hackers: 3925] Allow pcp_node_ino to list all backend nodes information

[Bo Peng]

I created a patch to allow pcp_node_info command to 
list all backend nodes information.

Currently pcp_node_info command can only display the node information 
which is specified using "-n" or "--node-id" option.

  $ pcp_node_info -w -p 11001 -n 0
  /tmp 11002 1 0.500000 waiting up primary primary 0 none none 2021-06-12 01:00:21

  $ pcp_node_info -w -p 11001 -n 1
  /tmp 11003 1 0.500000 waiting up standby standby 0 streaming async 2021-06-12 01:00:21


This patch allows pcp_node_info command to list all backend nodes information 
using "-a" or "--all" option.

  $ pcp_node_info -w -p 11001 -a 
  /tmp 11002 1 0.500000 waiting up primary primary 0 none none 2021-06-12 01:00:21
  /tmp 11003 1 0.500000 waiting up standby standby 0 streaming async 2021-06-12 01:00:21

  $ pcp_node_info -w -p 11001 -a -v
  Hostname               : /tmp
  Port                   : 11002
  Status                 : 1
  Weight                 : 0.500000
  Status Name            : waiting
  Backend Status Name    : up
  Role                   : primary
  Backend Role           : primary
  Replication Delay      : 0
  Replication State      : none
  Replication Sync State : none
  Last Status Change     : 2021-06-12 01:00:21

  Hostname               : /tmp
  Port                   : 11003
  Status                 : 1
  Weight                 : 0.500000
  Status Name            : waiting
  Backend Status Name    : up
  Role                   : standby
  Backend Role           : standby
  Replication Delay      : 0
  Replication State      : streaming
  Replication Sync State : async
  Last Status Change     : 2021-06-12 01:00:21


-- 
Bo Peng <pengbo at sraoss.co.jp>
SRA OSS, Inc. Japan
http://www.sraoss.co.jp/
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