xfstests: rework "dmapi" subtree build mechanism

The "dmapi" subtree was developed separate from and sort of wedged
into the rest of the "xfstests" code.  As a result, it has a lot of
build infrastructure that's just different from the unified way used
for everything else.

This patch changes all that, making the "dmapi" subtree be a more
normal component of "xfstests" with respect to its build process.

This involves removing all the cruft needed and used by the dmapi
"configure" script, and replacing each "Makefile.am" file with a
proper "Makefile" that includes a simple set of rules that are
compatible with the broader "xfstests" build.

The result is a much cleaner, consistent build.  It also deletes
a considerable amount of code.

Signed-off-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

.gitignore

@@ -12,27 +12,6 @@ include/config.h
 include/config.h.in
 lib/.libs
 
-dmapi/Makefile
-dmapi/config.log
-dmapi/config.status
-dmapi/libtool
-dmapi/src/Makefile
-dmapi/src/common/Makefile
-dmapi/src/common/cmd/.deps
-dmapi/src/common/cmd/Makefile
-dmapi/src/common/lib/.deps
-dmapi/src/common/lib/Makefile
-dmapi/src/sample_hsm/.deps
-dmapi/src/sample_hsm/Makefile
-dmapi/src/simple/.deps
-dmapi/src/simple/Makefile
-dmapi/src/suite1/Makefile
-dmapi/src/suite1/cmd/.deps
-dmapi/src/suite1/cmd/Makefile
-dmapi/src/suite2/Makefile
-dmapi/src/suite2/src/.deps
-dmapi/src/suite2/src/Makefile
-
 ltp/aio-stress
 ltp/doio
 ltp/fsstress