virsh-domain: Add quotes around '%s' formatting domain name

virsh-domain: Add quotes around '%s' formatting domain name

Domain name can contain spaces in which case it's not immediately clear
from virsh messages where the boundary of the name is. Enclose all %s
formatters in apostrophes as delimiters.

Done via the following vim regex:

 %s/omain %s/omain '%s'/g

This patch changes:

 $ virsh undefine --snapshots-metadata 'OWASP Broken Web Apps VM v1.2'
 Domain OWASP Broken Web Apps VM v1.2 has been undefined

to:

 $ virsh undefine --snapshots-metadata 'OWASP Broken Web Apps VM v1.2'
 Domain 'OWASP Broken Web Apps VM v1.2' has been undefined

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>