Made ULDB module kill other, obsolete LDM process

But only if the other process is like the potential process (type, mode)
and its subscription is a subset (possibly improper) of the potential
process.
Replaced ".debug" with ".*"
v6.11.3.5
Modified termination by ULDB and re-enabled subscription reduction

Another process is terminated only if the new process and the old
process are both feeders in primary mode.

Re-enabled subscription reduction for a subscription that isn't equal to
or a superset of an existing subscription for feeders in primary mode.
v6.11.3.6
Added reduction of subscriptions by downstream LDM.
Commented-out an unused but potentially useful function
v6.11.3.7
Improved clarity of code in sm_vetUpstreamLdm().
Removed use of IS_ALIVE functionality.
Undocumented use of IS_ALIVE and removed state-transition diagrams
Made ULDB kill obsolete feeder in alternate mode
v6.11.3.8
Removed primary-mode condition for termination of previous process
Returned RPC timeout to 60 seconds from 25

This should be OK as the upstream LDM now terminates obsolete, previous
LDM processes.
Improved internal commentary.
Improved internal commentary even more
Changed RPC timeout from 25 seconds to 60.
Re-enabled IS_ALIVE capability

Otherwise, a downstream 6.11.3 LDM could cause multiple orphaned
upstream LDM-s at a apre-6.11.3 site.
v6.11.3.9