Remove stressapptest.

Bug: 15193147

default.xml

@@ -258,7 +258,6 @@
   <project path="external/srtp" name="platform/external/srtp" groups="pdk-cw-fs" />
   <project path="external/stlport" name="platform/external/stlport" groups="pdk" />
   <project path="external/strace" name="platform/external/strace" groups="pdk-cw-fs" />
-  <project path="external/stressapptest" name="platform/external/stressapptest" groups="pdk-cw-fs" />
   <project path="external/svox" name="platform/external/svox" groups="pdk-cw-fs" />
   <project path="external/tagsoup" name="platform/external/tagsoup" groups="pdk-cw-fs,tradefed" />
   <project path="external/tcpdump" name="platform/external/tcpdump" groups="pdk,pdk-cw-fs" />