SMAPI scripts testing for VSMREQIN don't actually test connectivity

[viccross]

If communication with the TCPIP SVM has been interrupted in any way, the VSMREQIN SVM will be up but its listener will not be ready. So the script testing for the presence of VSMREQIN is useless since it may not be contactable.

Related to #91 (if we used IUCV to talk to SMAPI it wouldn't matter about the IP listener).

[viccross]

smcli qafl should be enough to verify that SMAPI is listening.

However if we switch to IUCV we'll need to test for VSMREQIU, and possibly even still just do the smcli qafl anyway.

[viccross]

smcli qafl doesn't work out of the box with the ancient smcli being used -- it needs to be patched to support recent SMAPI (update the return/reason code for z/VM 7.2).