Document possible access problems with custom IRONIC_VM_LOG_DIR path
Document possible access problems with custom IRONIC_VM_LOG_DIR path

Example local.conf from Ironic docs uses $HOME/ironic-bm-logs as VM log dir.
On some systems (e.g. Fedora) user's home is accessible only to the owner by
default which causes "permission denied" errors when starting VMs because
QEMU domains are running as non-root user ("qemu" in Fedora).

Extend the documentation with note about possible problems with custom
log directory set using IRONIC_VM_LOG_DIR.

Change-Id: Ia1d7688fd71c4853538621ec32b2d4a024f52a76
Closes-Bug: #1532184

SauloAislan/ironic,openstack/ironic,devananda/ironic,bacaldwell/ironic,dims/ironic,SauloAislan/ironic,dims/ironic,NaohiroTamura/ironic,openstack/ironic,pshchelo/ironic,NaohiroTamura/ironic,bacaldwell/ironic,pshchelo/ironic