utils: Mark inpipe as non-blocking
utils: Mark inpipe as non-blocking

Mark a virCommand's inpipe (write-end of pipe) as non-blocking so that it
will never block when we were to try to write too many bytes to it while
it doesn't have the capacity to hold them.

Signed-off-by: Stefan Berger <5c96973112e540fb909b13997fcd087e5bfbee96@linux.ibm.com>
Reviewed-by: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

fabianfreyer/libvirt,olafhering/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,olafhering/libvirt,olafhering/libvirt,jardasgit/libvirt,nertpinx/libvirt,libvirt/libvirt,crobinso/libvirt,libvirt/libvirt,zippy2/libvirt,jfehlig/libvirt,libvirt/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,crobinso/libvirt,jardasgit/libvirt,jfehlig/libvirt,andreabolognani/libvirt,zippy2/libvirt,zippy2/libvirt,jfehlig/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,libvirt/libvirt,crobinso/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,jardasgit/libvirt,nertpinx/libvirt,zippy2/libvirt,crobinso/libvirt,nertpinx/libvirt,olafhering/libvirt,andreabolognani/libvirt