Add DejaGnu (make check) README, minor change to Makefiles

testsuite/slurm_unit/README

+Deja Gnu Unit Tests
+
+1. These tests execute only when Slurm is built directly in the source
+   directory, not when a separate build directory is used.
+2. Insure the "expect", "dejagnu" and "check" packages are installed.
+3. From the top level source directory, execute "make check", which builds
+   the executable files including various src/common/*.o files that will be
+   unit tested.
+3. Change working directory to "testsuite/slurm_unit".
+4. Execute "make check" to execute the unit tests.

testsuite/slurm_unit/common/Makefile.am

@@ -14,7 +14,6 @@ TESTS = \
 if HAVE_CHECK
 MYCFLAGS  = @CHECK_CFLAGS@ -Wall -ansi -pedantic -std=c99
 MYCFLAGS += -D_ISO99_SOURCE -Wunused-but-set-variable
-MYCFLAGS += -I$(top_srcdir)/src/common
 MYCFLAGS += $(top_builddir)/src/common/libcommon.la
 TESTS += xtree-test \
 		 xhash-test

testsuite/slurm_unit/common/Makefile.in

@@ -378,7 +378,6 @@ LDADD = $(top_builddir)/src/api/libslurm.o $(DL_LIBS) $(HWLOC_LIBS)
 @HAVE_CHECK_TRUE@MYCFLAGS = @CHECK_CFLAGS@ -Wall -ansi -pedantic \
 @HAVE_CHECK_TRUE@	-std=c99 -D_ISO99_SOURCE \
 @HAVE_CHECK_TRUE@	-Wunused-but-set-variable \
-@HAVE_CHECK_TRUE@	-I$(top_srcdir)/src/common \
 @HAVE_CHECK_TRUE@	$(top_builddir)/src/common/libcommon.la
 @HAVE_CHECK_TRUE@xtree_test_CFLAGS = $(MYCFLAGS)
 @HAVE_CHECK_TRUE@xtree_test_LDADD = @CHECK_LIBS@