Provide actionable feedback on startup if either forkexecd is missing or if the xen hypercall interface cannot be opened.
Provide actionable feedback on startup if either forkexecd is missing or if the xen hypercall interface cannot be opened.

djs55/xenopsd-previous,koushikcgit/xenopsd,euanh/xenopsd,simonjbeaumont/xenopsd,euanh/xenopsd,djs55/xenopsd,euanh/xenopsd,djs55/xenopsd,simonjbeaumont/xenopsd,simonjbeaumont/xenopsd,cheng--zhang/xenopsd,koushikcgit/xenopsd,thomassa/xenopsd,djs55/xenopsd,cheng--zhang/xenopsd,johnelse/xenopsd,djs55/xenopsd-previous,djs55/xenopsd-previous,johnelse/xenopsd,koushikcgit/xenopsd,johnelse/xenopsd,thomassa/xenopsd,thomassa/xenopsd,cheng--zhang/xenopsd