qemu: Introduce qemuBuildMonitorCommandLine
qemu: Introduce qemuBuildMonitorCommandLine

Add new function to manage adding the '-mon' or '-monitor' options to
the command line removing that task from the mainline qemuBuildCommandLine.

Also adjusted qemuBuildChrChardevStr and qemuBuildChrArgStr to use
const virDomainChrSourceDef *def rather than virDomainChrSourceDefPtr def.

Signed-off-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>

libvirt/libvirt,andreabolognani/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,olafhering/libvirt,fabianfreyer/libvirt,datto/libvirt,crobinso/libvirt,jardasgit/libvirt,andreabolognani/libvirt,crobinso/libvirt,eskultety/libvirt,zippy2/libvirt,olafhering/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,crobinso/libvirt,libvirt/libvirt,taget/libvirt,zippy2/libvirt,VenkatDatta/libvirt,zippy2/libvirt,olafhering/libvirt,datto/libvirt,datto/libvirt,jardasgit/libvirt,datto/libvirt,jfehlig/libvirt,datto/libvirt,taget/libvirt,eskultety/libvirt,jardasgit/libvirt,jfehlig/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,eskultety/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,olafhering/libvirt,nertpinx/libvirt,andreabolognani/libvirt,zippy2/libvirt,taget/libvirt,libvirt/libvirt,eskultety/libvirt,taget/libvirt,fabianfreyer/libvirt,crobinso/libvirt,libvirt/libvirt,eskultety/libvirt,jardasgit/libvirt,taget/libvirt,nertpinx/libvirt,jardasgit/libvirt