[Regression] Update LTP tests to the upstream version

Jenkinsfiles/Linux

@@ -22,6 +22,7 @@ pipeline {
                             '''
                         sh '''
                             cd LibOS/shim/test/apps/ltp
+                            git submodule update --init src
                             make
                             ./syscalls.sh
                             '''

Jenkinsfiles/Linux-Debug

@@ -22,6 +22,7 @@ pipeline {
                             '''
                         sh '''
                             cd LibOS/shim/test/apps/ltp
+                            git submodule update --init src
                             make
                             ./syscalls.sh
                             '''

LibOS/shim/test/apps

@@ -1 +1 @@
-Subproject commit 08cc262d443f33e6f08c2d8de494fc12bd846449
+Subproject commit cad9612ea22692781e4da0b0f2fcd0086ddeca57