Modify test so "n/a" in sinfo output OK

Previous logic would stop at "/".

testsuite/expect/test4.13

@@ -4,7 +4,6 @@
 #          Validate that sinfo -O (--Format) option displays the
 #          correct user specified values.
 #
-#
 # Output:  "TEST: #.#" followed by "SUCCESS" if test was successful, OR
 #          "FAILURE: ..." otherwise with an explanation of the failure, OR
 #          anything else indicates a failure mode that must be investigated.
@@ -37,7 +36,7 @@ set test_id             4.13
 set test_acct           "test$test_id\_acct"
 set test_part           "test$test_id\_part"
 set test_node           [get_idle_node_in_part [default_partition]]
-set alpha_numeric_dot   "\[a-zA-Z0-9_.:\-\]+"
+set alpha_numeric_dot   "\[a-zA-Z0-9/_.:\-\]+"
 set exit_code           0
 
 array set node_sinfo_vals { }