The branch "stable/hydrogen" creation:
1. This branch is inititiated from the head "snmp4sdn-bulk-release-1"
2. The snmp4sdn plugin in the published Hydrogen release is the snapshot "master-tagforprepareonly-snmp4sdn-bulk-release-3"
3. There are differences between 1 and 2, so in this commit:
(a) update from 1 to 2
(b) edit pom files and update versions by adding "-1-SNAPSHOT"

ps. 3(a) seems not to be needed in other project, because in other project the "xxx-bulk-release-X" is within "xxx-bulk-release-1", but in snmp4sdn it doesn't like this :(, so I update it manually

Signed-off-by: ylhsieh <ylhsieh@itri.org.tw>
Merge "The branch "stable/hydrogen" creation: 1. This branch is inititiated from the head "snmp4sdn-bulk-release-1" 2. The snmp4sdn plugin in the published Hydrogen release is the snapshot "master-tagforprepareonly-snmp4sdn-bulk-release-3" 3. There are differences between 1 and 2, so in this commit: (a) update from 1 to 2 (b) edit pom files and update versions by adding "-1-SNAPSHOT"" into stable/hydrogen