Added printout of X509_CERT_DIR in xrootd-fallback

SiteTests/testjob/tests/CE-cms-xrootd-fallback

@@ -238,12 +238,14 @@ def main():
     pilot_uid = os.geteuid()
 
     pilot_proxy = os.environ.get("X509_USER_PROXY", "/tmp/x509up_u%d" % pilot_uid)
+    cert_dir = os.environ.get("X509_CERT_DIR", "undefined")
     if not os.path.isfile(pilot_proxy):
         return print_summary("X509_USER_PROXY=%s is not a file" % pilot_proxy, NAG_CRITICAL)
 
     log.info("X509_USER_PROXY=%s" % pilot_proxy)
+    log.info("X509_CERT_DIR=%s" % cert_dir)
 
-    # Workaround to suppress voms errors on OSG
+# Workaround to suppress voms errors on OSG
     os.environ["VOMS_PROXY_INFO_DONT_VERIFY_AC"] = "1"
 
     if 'OSG_GRID' in os.environ and not find_executable('gfal-copy'):