autobuild.sh: don't check for untracked files in submodules

This is a somewhat temporary workaround for avoiding git status
errors related to symlinked files in the DPDK submodule.  The
build pools will be fixed to not change symlinks to regular
files when copying repositories between systems, but until
then apply this fix so we can move forward with switching
to DPDK 18.05 (which now has symlinked files in its
repository).

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I8a6df76fb77a6f3ee3817bd975d198ae4cc3014a
Reviewed-on: https://review.gerrithub.io/420444
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>

autobuild.sh

@@ -73,7 +73,7 @@ timing_exit "$make_timing_label"
 
 # Check for generated files that are not listed in .gitignore
 timing_enter generated_files_check
-if [ `git status --porcelain | wc -l` -ne 0 ]; then
+if [ `git status --porcelain --ignore-submodules | wc -l` -ne 0 ]; then
 	echo "Generated files missing from .gitignore:"
 	git status --porcelain
 	exit 1

autopackage.sh

@@ -14,7 +14,7 @@ timing_enter autopackage
 
 $MAKE clean
 
-if [ `git status --porcelain | wc -l` -ne 0 ]; then
+if [ `git status --porcelain --ignore-submodules | wc -l` -ne 0 ]; then
 	echo make clean left the following files:
 	git status --porcelain
 	exit 1