Description of problem: The  last_stat_fetch time information displayed in the statedump 


Version-Release number of selected component (if applicable): upstream


How reproducible: Consistently


Steps to Reproduce:
1. kill -USR1 <pid of glusterfs>


  
Actual results:

[xlator.cluster.dht.test2-dht.priv]
subvol_cnt=2
subvolumes[0]=protocol/client.test2-client-0
file_layouts[0].cnt=1
file_layouts[0].preset=1
file_layouts[0].gen=0
file_layouts[0].type=0
file_layouts[0].list[0].err=0
file_layouts[0].list[0].start=0
file_layouts[0].list[0].stop=0
file_layouts[0].list[0].xlator.type=protocol/client
file_layouts[0].list[0].xlator.name=test2-client-0
subvolume_status[0]=1
subvolumes[1]=protocol/client.test2-client-1
file_layouts[1].cnt=1
file_layouts[1].preset=1
file_layouts[1].gen=0
file_layouts[1].type=0
file_layouts[1].list[0].err=0
file_layouts[1].list[0].start=0
file_layouts[1].list[0].stop=0
file_layouts[1].list[0].xlator.type=protocol/client
file_layouts[1].list[0].xlator.name=test2-client-1
subvolume_status[1]=1
search_unhashed=1
gen=3
min_free_disk=10
min_free_inodes=5
disk_unit=
refresh_interval=0
unhashed_sticky_bit=0
du_stats.avail_percent=94.000000
du_stats.avail_space=96741781504
du_stats.avail_inodes=99.000000
du_stats.log=0
last_stat_fetch=Thu Jan  1 05:30:00 1970



Expected results: It should display the proper valid time.