Add agent_ipmitool support

This patch enables to use the agent_ipmitool deploy driver to
deploy the ironic on real hardware, instead of virtual machine.

It also append the deploy driver name to the kernel/ramdisk
path, so that if developer switch the deploy driver after
./unstack.sh, devstack will use the correct kernel/ramdisk.

Change-Id: Iac0415f6895d037c876e137aa4f2bf2990eb47c5
Ensure syslog option is honored by neutron and tempest

Syslog settings were not configured at all for these two
projects. As a result, regardless of the value of the
SYSLOG environment variable, the use_syslog options for
these two projects was always set to False.

Change-Id: Iba6155d62beffa06e5bb9ac16b06082ec64d0926
Closes-Bug: #1394024
Merge "Add agent_ipmitool support"
Merge "Ensure syslog option is honored by neutron and tempest"