add compare-results.sh, call from start-testsuite.sh

Compare current test results to the expected results, and exit in error on
discrepancies.

Add compare-result.sh: (trivially) grep junit xml output to determine which
tests passed and which didn't, and compare against an expected-result.log,
another junit file from a previous run. Summarize and determine success.

Include an "xfail" feature: tests that are expected to fail are marked as
"xfail", unexpected failures as "FAIL".

In various subdirs, copy the current jenkins jobs' junit xml outputs as
expected-results.log, so that we will start getting useful output in both
jenkins runs and manual local runs.

In start-testsuite.sh, after running the tests, invoke the results comparison.

Due to the single-line parsing nature, the script so far does not distinguish
between error and failure. I doubt that we actually need to do that though.

Related: OS#3136
Change-Id: I87d62a8be73d73a5eeff61a842e7c27a0066079d
diff --git a/ggsn_tests/expected-results.log b/ggsn_tests/expected-results.log
new file mode 100644
index 0000000..bff953a
--- /dev/null
+++ b/ggsn_tests/expected-results.log
@@ -0,0 +1,14 @@
+<?xml version="1.0"?>
+<testsuite name='GGSN_Tests' tests='11' failures='0' errors='0' skipped='0' inconc='0' time='205.00'>
+  <testcase classname='GGSN_Tests' name='TC_pdp4_act_deact' time='0.006364'/>
+  <testcase classname='GGSN_Tests' name='TC_pdp4_act_deact_ipcp' time='0.003752'/>
+  <testcase classname='GGSN_Tests' name='TC_pdp4_act_deact_pcodns' time='0.003510'/>
+  <testcase classname='GGSN_Tests' name='TC_pdp4_act_deact_gtpu_access' time='6.011141'/>
+  <testcase classname='GGSN_Tests' name='TC_pdp4_clients_interact' time='0.006517'/>
+  <testcase classname='GGSN_Tests' name='TC_pdp6_act_deact' time='0.003312'/>
+  <testcase classname='GGSN_Tests' name='TC_pdp6_act_deact_pcodns' time='0.003403'/>
+  <testcase classname='GGSN_Tests' name='TC_pdp6_act_deact_icmp6' time='0.005114'/>
+  <testcase classname='GGSN_Tests' name='TC_pdp6_act_deact_gtpu_access' time='9.018065'/>
+  <testcase classname='GGSN_Tests' name='TC_pdp6_clients_interact' time='6.014695'/>
+  <testcase classname='GGSN_Tests' name='TC_echo_req_resp' time='0.001674'/>
+</testsuite>