glusterd: Coverity fix for string_overflow overrun

In function glusterd_dump_peer() it is copying "input_key" into "key"
buffer without checking the length which might cause string_overflow
overrun. Similar problem with other coverity issue.
With this fix it will copy "input_key" into "key" buffer by maximum
length of buffer.

Coverity CID: 1256171
Coverity CID: 1256172
Coverity CID: 1256174

Change-Id: I4e092309d9503bd79ff82cf83ed5e8d758743453
BUG: 1093692
Signed-off-by: Gaurav Kumar Garg  ggarg <ggarg@redhat.com>
Reviewed-on: http://review.gluster.org/9208
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
Reviewed-by: Kaushal M <kaushal@redhat.com>