glusterd: Add hostname to list instead of replaceing upon update

Change-Id: I2c916818d0ea9f28ac40359143c1b73bf00cdc2f
Signed-off-by: Varun Shastry <vshastry@redhat.com>
Merge pull request #1 from vpshastry/better-peer-identification

glusterd: Add hostname to list instead of replaceing upon update