A plugin for collectd is added to use collectd on compute as a
monitor type. Monitor files are updated accordingly.
The inspector now listens on all interfaces instead of only
localhost to enable it to communicate with compute node.
JIRA: DOCTOR-86
JIRA: DOCTOR-101
Change-Id: Idc834d428152e4687020eff7d8db36a652b1bf86
Signed-off-by: Umar Farooq <umar.farooq@neclab.eu>