remove inclusion of the run_iocsh script and change tests and targets accordingly; idea is that run-iocsh is a required package but not part of require per se

Uses IOCNAME environment variable value if this is defined. This
makes the require PVs persistent across IOC restarts. Falls back
to the original definition of hostname and PID if the IOCNAME
environment variable is not defined.

Added RULES_DBDCAT file extracted from RULES.Db in epics base. This is so that you can use DBDCAT within E3

Sync with tag 7.0.3.1-3.1.2/R-3.1.2-b02bfff5-1911181214