test-container: Install with $(sorted-subdirs) [BZ #24794]

Commit 35e038c1d2 started to use an
incomplete list of subdirs based on $(all-subdirs) causing
testroot.pristine to miss files from nss.

Tested if the list of files in testroot.pristine remains the same.

	[BZ #24794]
	* Makeconfig (all-subdirs): Improved source comments.
	* Makefile (testroot.pristine/install.stamp): Pass
	subdirs='$(sorted-subdirs)' to make install.

ChangeLog

@@ -1,3 +1,11 @@
+2019-07-29  DJ Delorie  <dj@redhat.com>
+	    Tulio Magno Quites Machado Filho  <tuliom@linux.ibm.com>
+
+	[BZ #24794]
+	* Makeconfig (all-subdirs): Improved source comments.
+	* Makefile (testroot.pristine/install.stamp): Pass
+	subdirs='$(sorted-subdirs)' to make install.
+
 2019-07-25  Florian Weimer  <fweimer@redhat.com>
 
 	[BZ #24677]

Makeconfig

@@ -1267,9 +1267,9 @@ else
 libsupport = $(common-objpfx)support/libsupport.a
 endif
 
-# These are the subdirectories containing the library source.  The order
-# is more or less arbitrary.  The sorting step will take care of the
-# dependencies.
+# This is a partial list of subdirectories containing the library source.
+# The order is more or less arbitrary.  The sorting step will take care of the
+# dependencies and generate sorted-subdirs dynamically.
 all-subdirs = csu assert ctype locale intl catgets math setjmp signal	    \
 	      stdlib stdio-common libio malloc string wcsmbs time dirent    \
 	      grp pwd posix io termios resource misc socket sysvipc gmon    \

Makefile

@@ -402,7 +402,7 @@ ifeq ($(run-built-tests),yes)
 	  done
 endif
 	$(MAKE) install DESTDIR=$(objpfx)testroot.pristine \
-	  subdirs='$(all-subdirs)'
+	  subdirs='$(sorted-subdirs)'
 	touch $(objpfx)testroot.pristine/install.stamp
 
 tests-special-notdir = $(patsubst $(objpfx)%, %, $(tests-special))