[Libvir] Record an error when refusing a read-only operation

The libvirt.c front-end can be compiled in 'pedantic' mode in which case it explicitly refuses operations with side-effects in read-only connections. When doing so, however, it was not recording any error message so feedback to the user was misleading / obsure. This patch adds an extra error code VIR_ERR_READ_ONLY which is used when an operation is denied due to a read only connection. This patch also passes 'VIR_DRV_OPEN_QUIET' to the 'open' method so tell the XenD driver not complain if it fails to open a HV connection. This is because it was complaining whenever trying to open a test:///default connection. Dan. -- |=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=| |=- Perl modules: http://search.cpan.org/~danberr/ -=| |=- Projects: http://freshmeat.net/~danielpb/ -=| |=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=|