explorers for types with clashing names not pushed to target

Thorsten Steenbock reported a bug where types with similar names, e.g
__first
__first_second
would interfere when transfering explorers to the target host.

Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>

bin/cdist-config

@@ -398,7 +398,7 @@ __cdist_type_has_explorer()
 __cdist_type_explorer_pushed()
 {
    [ -f "${__cdist_out_type_dir}/${__cdist_name_type_explorer_pushed}" ] \
-      && grep -q "$1" "${__cdist_out_type_dir}/${__cdist_name_type_explorer_pushed}"
+      && grep -x -q "$1" "${__cdist_out_type_dir}/${__cdist_name_type_explorer_pushed}"
 }
 
 __cdist_type_explorer_pushed_add()