Fixed for Issue#1089

[yosukehara]

I've confirmed that LeoGateway is properly killing the process itself when LeoManager nodes' IP address are incorrectly configured.

Error Log:

[E]	gateway_0@127.0.0.1	2018-07-31 13:31:44.696972 +0900	1533011504	
	leo_gateway_app:after_process_0/1	242	
	[{cause,connection_failure},
	 {error_nodes,['[email protected]']}]

LeoFS' Processes and the result of leofs-adm status:

$ ps aux | grep beam.smp | grep leo_
yosuke    3365  0.7  1.6 3953536 67912 pts/2   Ssl+ 13:30   0:02 /home/yosuke/dev/projects/leo-project/private/y05uk-dev-leofs/package/leo_manager_0/erts-9.3.3/bin/beam.smp -A 32 -K true -P 1048576 -- -root /home/yosuke/dev/projects/leo-project/private/y05uk-dev-leofs/package/leo_manager_0 -progname leo_manager -- -home /home/yosuke -- -heart -boot /home/yosuke/dev/projects/leo-project/private/y05uk-dev-leofs/package/leo_manager_0/releases/1/leo_manager -mode embedded -config /home/yosuke/dev/projects/leo-project/private/y05uk-dev-leofs/package/leo_manager_0/etc/app.config -config ./snmp/snmpa_manager_0/leo_manager_snmp -smp enable -setcookie 401321b4 -name [email protected] -- console
yosuke    3808  0.7  1.6 3952000 68444 pts/3   Ssl+ 13:30   0:02 /home/yosuke/dev/projects/leo-project/private/y05uk-dev-leofs/package/leo_manager_1/erts-9.3.3/bin/beam.smp -A 32 -K true -P 1048576 -- -root /home/yosuke/dev/projects/leo-project/private/y05uk-dev-leofs/package/leo_manager_1 -progname leo_manager -- -home /home/yosuke -- -heart -boot /home/yosuke/dev/projects/leo-project/private/y05uk-dev-leofs/package/leo_manager_1/releases/1/leo_manager -mode embedded -config /home/yosuke/dev/projects/leo-project/private/y05uk-dev-leofs/package/leo_manager_1/etc/app.config -config ./snmp/snmpa_manager_1/leo_manager_snmp -hidden -smp enable -setcookie 401321b4 -name [email protected] -- console
yosuke    4253  1.6  1.6 3933204 65836 pts/4   Ssl+ 13:30   0:05 /home/yosuke/dev/projects/leo-project/private/y05uk-dev-leofs/package/leo_storage/erts-9.3.3/bin/beam.smp -secio true -zdbbl 32768 -scl true -A 32 -K true -P 1048576 -- -root /home/yosuke/dev/projects/leo-project/private/y05uk-dev-leofs/package/leo_storage -progname leo_storage -- -home /home/yosuke -- -heart -boot /home/yosuke/dev/projects/leo-project/private/y05uk-dev-leofs/package/leo_storage/releases/1/leo_storage -mode minimal -config /home/yosuke/dev/projects/leo-project/private/y05uk-dev-leofs/package/leo_storage/etc/app.config -config ./snmp/snmpa_storage_0/leo_storage_snmp -smp enable -setcookie 401321b4 -name [email protected] -- console

$ ./leofs-adm status
 [System Confiuration]
-----------------------------------+----------
 Item                              | Value
-----------------------------------+----------
 Basic/Consistency level
-----------------------------------+----------
                    system version | 1.4.2
                        cluster Id | leofs_1
                             DC Id | dc_1
                    Total replicas | 1
          number of successes of R | 1
          number of successes of W | 1
          number of successes of D | 1
 number of rack-awareness replicas | 0
                         ring size | 2^128
-----------------------------------+----------
 Multi DC replication settings
-----------------------------------+----------
 [mdcr] max number of joinable DCs | 2
 [mdcr] total replicas per a DC    | 1
 [mdcr] number of successes of R   | 1
 [mdcr] number of successes of W   | 1
 [mdcr] number of successes of D   | 1
-----------------------------------+----------
 Manager RING hash
-----------------------------------+----------
                 current ring-hash | 433fe365
                previous ring-hash | 433fe365
-----------------------------------+----------

 [State of Node(s)]
-------+--------------------------+--------------+---------+----------------+----------------+----------------------------
 type  |           node           |    state     | rack id |  current ring  |   prev ring    |          updated at
-------+--------------------------+--------------+---------+----------------+----------------+----------------------------
  S    | [email protected]      | running      |         | 433fe365       | 433fe365       | 2018-07-31 13:31:05 +0900
-------+--------------------------+--------------+---------+----------------+----------------+----------------------------

[mocchira]

LGTM. I'll merge once the all tests get passed.