Log ZTS test name to dmesg

Log each test name to dmesg to help post-mortem test failures.
Specifically, to help debug #10940.

Signed-off-by: Tony Hutter <hutter2@llnl.gov>

TEST

@@ -5,21 +5,21 @@
 #TEST_PREPARE_SHARES="yes"
 
 ### ztest
-#TEST_ZTEST_SKIP="yes"
+TEST_ZTEST_SKIP="yes"
 #TEST_ZTEST_TIMEOUT=1800
 #TEST_ZTEST_DIR="/var/tmp/"
 #TEST_ZTEST_OPTIONS="-V"
 #TEST_ZTEST_CORE_DIR="/mnt/zloop"
 
 ### zimport
-#TEST_ZIMPORT_SKIP="yes"
+TEST_ZIMPORT_SKIP="yes"
 #TEST_ZIMPORT_DIR="/var/tmp/zimport"
 #TEST_ZIMPORT_VERSIONS="master installed"
 #TEST_ZIMPORT_POOLS="zol-0.6.1 zol-0.6.2 master installed"
 #TEST_ZIMPORT_OPTIONS="-c"
 
 ### xfstests
-#TEST_XFSTESTS_SKIP="yes"
+TEST_XFSTESTS_SKIP="yes"
 #TEST_XFSTESTS_URL="https://github.com/behlendorf/xfstests/archive/"
 #TEST_XFSTESTS_VER="zfs.tar.gz"
 #TEST_XFSTESTS_POOL="tank"
@@ -38,7 +38,7 @@
 #TEST_ZFSTESTS_TAGS="functional"
 
 ### zfsstress
-#TEST_ZFSSTRESS_SKIP="yes"
+TEST_ZFSSTRESS_SKIP="yes"
 #TEST_ZFSSTRESS_URL="https://github.com/nedbass/zfsstress/archive/"
 #TEST_ZFSSTRESS_VER="master.tar.gz"
 #TEST_ZFSSTRESS_RUNTIME=300

tests/test-runner/bin/test-runner.py.in

@@ -276,6 +276,10 @@ User: %s
         except OSError as e:
             fail('%s' % e)
 
+        # On Linux, write the test name to dmesg for bug post-mortem
+        mycmd="sudo ksh -c \"if [[ -e /dev/kmsg ]] ; then echo ZTS running: %s > /dev/kmsg; fi\"" % self.pathname
+        os.system(mycmd)
+
         self.result.starttime = monotonic_time()
         proc = Popen(privcmd, stdout=PIPE, stderr=PIPE)
         # Allow a special timeout value of 0 to mean infinity