collecting linux kernel logs

[shuklanirdesh82]

As of now we are collecting plugin,driver and esx hostd log(https://github.com/vmware/docker-volume-vsphere/blob/master/misc/drone-scripts/dump_log.sh#L18).

Need to extend log collection script for guest vm's linux kernel log.

CI: https://ci.vmware.run/vmware/docker-volume-vsphere/1582

For photon VM (collecting logs via journalctl utility):

=> /var/log/syslog Thu Mar 9 09:11:07 UTC 2017

=> false Thu Mar 9 09:11:07 UTC 2017

=> invoking journalctl Thu Mar 9 09:11:07 UTC 2017

-- Logs begin at Thu 2017-03-09 08:30:19 UTC, end at Thu 2017-03-09 09:11:07 UTC. --
Mar 09 08:30:13 photon-klJ0Zth7o systemd[431]: Time has been changed
Mar 09 08:30:13 photon-klJ0Zth7o systemd[1]: systemd-networkd.service: Watchdog timeout (limit 3min)!
Mar 09 08:30:13 photon-klJ0Zth7o systemd[1]: Time has been changed
Mar 09 08:30:13 photon-klJ0Zth7o systemd[1]: systemd-udevd.service: Watchdog timeout (limit 3min)!
Mar 09 08:30:13 photon-klJ0Zth7o systemd[1]: systemd-networkd.service: Main process exited, code=killed, status=6/ABRT

for ubuntu (from /var/log/syslog):

=> /var/log/syslog Thu Mar 9 09:11:08 UTC 2017

=> true Thu Mar 9 09:11:08 UTC 2017

Mar  9 06:28:27 sc-rdops-vm18-dhcp-57-89 dhclient[1073]: DHCPREQUEST of 192.168.31.85 on ens160 to 192.168.31.1 port 67 (xid=0x4a75a292)
Mar  9 06:28:27 sc-rdops-vm18-dhcp-57-89 dhclient[1073]: DHCPACK of 192.168.31.85 from 192.168.31.1
Mar  9 06:28:27 sc-rdops-vm18-dhcp-57-89 dhclient[1073]: bound to 192.168.31.85 -- renewal in 260 seconds.
Mar  9 06:31:40 sc-rdops-vm18-dhcp-57-89 systemd[1]: systemd-udevd.service: Watchdog timeout (limit

fixes #1008

//CC @govint

[govint]

Looks good.