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even if systest itself cannot be run for such build environment.
also added an explicit check about the assumption in conf.sh with
an error message explaining what's wrong.

(make test is for unittests in BIND 10)

so that we can run multiple instances of bind10 system (mainly for system
purposes)

so that we can use the same env variable for similar purposes, e.g.
communication path betwen b10-auth and xfrout.

[trac606] Merge commit '309d02a5' (in a personal branch) into trac606 with resolving conflicts.

This commit adjusts test framework so that it will work with BIND 10.

Conflicts:
	tests/system/start.pl
	tests/system/stop.pl

mainly intended for testing purposes, so disabled by default.
for testing this feature bind10_test.py is renamed to bind10_test.py.in
and is auto generated by the configure script.

this is one of prerequisites to perform various system tests.

Conflicts:
	src/bin/xfrout/xfrout.py.in