entrypoint: set default env var for requiring cephfs mount point

When running cephfs tests locally there is no strong urge to require
an environment exactly like that of the test container. However, we do
want tests run under the container image (especially our default ci) to
use the cephfs mountpoint as they were previously. Set a default value
in the entrypoint script to require the mountpoint so we don't
accidentally miss the tests if something unexpected goes wrong.

Signed-off-by: John Mulligan <jmulligan@redhat.com>

entrypoint.sh

@@ -12,6 +12,10 @@ BUILD_TAGS=""
 RESULTS_DIR=/results
 CEPH_CONF=/tmp/ceph/ceph.conf
 
+# env vars consumed by go code directly.
+# set defaults if they are currently unset in the environment
+: "${GO_CEPH_TEST_REQUIRE_MOUNT:=yes}"
+
 CLI="$(getopt -o h --long test-run:,test-pkg:,pause,cpuprofile,memprofile,no-cover,micro-osd:,results:,ceph-conf:,help -n "${0}" -- "$@")"
 eval set -- "${CLI}"
 while true ; do
@@ -155,7 +159,7 @@ post_all_tests() {
 test_go_ceph() {
     mkdir -p /tmp/ceph
     show "${MICRO_OSD_PATH}" /tmp/ceph
-    export CEPH_CONF
+    export CEPH_CONF GO_CEPH_TEST_REQUIRE_MOUNT
 
     if [[ ${TEST_RUN} == NONE ]]; then
         echo "skipping test execution"