Reduce logging of host hypervisor capabilities to DEBUG level
Reduce logging of host hypervisor capabilities to DEBUG level

While the results of invoking libvirt's getCapabilities() API call get
deliberately logged at INFO level[0], doing the same for
getDomainCapabilities() is one bridge too far, because we call it once
per (architecture, default_machine_type) tuple.

So heed the suggestions of Stephen and Eric[1] and reduce it to DEBUG level.

[0] See Ica0dccbfbff89829a7e631adaaf2cde13c449773 at
    https://review.opendev.org/#/c/158334/
[1] https://review.opendev.org/#/c/655268/3/nova/virt/libvirt/host.py@777

Change-Id: Idb4c4380c32f78d639f41cb1b5204578e1a19cd3

openstack/nova,openstack/nova,rahulunair/nova,mahak/nova,klmitch/nova,openstack/nova,rahulunair/nova,klmitch/nova,mahak/nova,klmitch/nova,klmitch/nova,rahulunair/nova,mahak/nova