Tried to improve TSM connection test and renamed misspelled 389_check…

…_TSM_connexion.sh into 389_check_TSM_connection.sh (issue 1534)

usr/share/rear/verify/TSM/default/389_check_TSM_connection.sh

@@ -0,0 +1,17 @@
+# Test connection to the TSM server.
+#
+# TODO: This should be enhanced to request a TSM password from the user
+# when there is no TSM password file 'TSM.PWD' in the recovery system
+# cf. https://github.com/rear/rear/issues/1642
+#
+# Regarding usage of '0<&6 1>&7 2>&8' see
+# "What to do with stdin, stdout, and stderr"
+# in https://github.com/rear/rear/wiki/Coding-Style
+#
+# First try "dsmc query session" because it is faster than "dsmc query mgmt":
+dsmc query session 0<&6 1>&7 2>&8 && return
+LogPrintError "Possibly no connection to TSM server ('dsmc query session' returns '$?')"
+# When "dsmc query session" failed try "dsmc query mgmt":
+dsmc query mgmt 0<&6 1>&7 2>&8 && return
+Error "No connection to TSM server ('dsmc query mgmt' returns '$?')"
+