make bind unit tests more robust on travis-ci

My previous commit failed in the travis-ci environment despite passing on my
local computer. This appears to be due to expect timing out looking for the
expected input. See if increasing the expect timeout slightly fixes the
problem.

tests/interactive.expect.rc

@@ -5,7 +5,7 @@ log_file -noappend interactive.tmp.log
 
 set fish ../fish
 
-set timeout 4
+set timeout 5
 
 set send_human {.05 .1 5 .02 .2}