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This overcomes the build failure on Solaris where it complains about
incompatible types of ? operands.

Also fix typos in afsdb_18.cc doxygen comments.

This is ticket http://bind10.isc.org/ticket/2747

It has been failing on distclean for long time
due to file left around.

Newer python's keep under __pycache__ which was already handled.

Reviewed on jabber.

msgq_run_test.py uses src/lib/python/isc/cc/proto_defs.py which
uses cc_generated version which created some .pyo files:
./src/lib/python/isc/cc/cc_generated/__init__.pyo
./src/lib/python/isc/cc/cc_generated/proto_defs.pyo
which are left over after distclean.

quick review via jabber

to support prefix delegation which has not been designed yet.

Few more occurrences of the magic keywords scattered through the code
replaced by constants.

Instead of hard-coded enum type. The data source should be agnostic to
the type.

Saying the segments are for in-memory cache. Also adding note about
future extending and exceptions.

SEGMENT_MAPPED may be misleading in case of locally-allocated memory.
Using SEGMENT_INUSE.

So that output of addresses is now consistent

mainly for rationalizing lettuce tests that are coming after this.