Add exceptions to DRAC plugin
Add exceptions to DRAC plugin

This patch adds exceptions when the DRAC plugin fails, because the supplemental pack is not installed or because the connection or credentials fail.

Signed-off-by: Javier Alvarez-Valle <cf4c8668a0b4c5e013f594a6940d05b3d4d9ddcf@citrix.com>

koushikcgit/xcp-networkd,koushikcgit/xcp-rrdd,simonjbeaumont/xcp-rrdd,djs55/xcp-networkd,sharady/xcp-networkd,koushikcgit/xcp-networkd,djs55/xcp-networkd,johnelse/xcp-rrdd,simonjbeaumont/xcp-rrdd,johnelse/xcp-rrdd,sharady/xcp-networkd,robhoes/squeezed,djs55/xcp-rrdd,koushikcgit/xcp-rrdd,djs55/squeezed,koushikcgit/xcp-rrdd,djs55/xcp-rrdd