[wp] push timeouts for a few tests

src/plugins/wp/tests/wp_acsl/oracle_qualif/simpl_is_type.res.oracle

-# frama-c -wp [...]
+# frama-c -wp -wp-timeout 3 [...]
 [kernel] Parsing simpl_is_type.i (no preprocessing)
 [wp] Running WP plugin...
 [wp] [Valid] Goal check_acsl_exits (Cfg) (Unreachable)

src/plugins/wp/tests/wp_acsl/simpl_is_type.i

@@ -3,7 +3,7 @@
 */
 
 /* run.config_qualif
-   OPT: -wp-simplify-is-cint -wp-prop=-ko,-lack
+   OPT: -wp-simplify-is-cint -wp-prop=-ko,-lack -wp-timeout 3
 */
 
 /** Tests the simplification of (forall x:int. P) into (forall

src/plugins/wp/tests/wp_typed/oracle_qualif/user_init.0.res.oracle

-# frama-c -wp [...]
+# frama-c -wp -wp-timeout 4 [...]
 [kernel] Parsing user_init.i (no preprocessing)
 [wp] Running WP plugin...
 [wp] [Valid] Goal init_exits (Cfg) (Unreachable)

src/plugins/wp/tests/wp_typed/user_init.i

 /* run.config_qualif
 
-   OPT: -wp-prop=-lack,-tactic
+   OPT: -wp-prop=-lack,-tactic -wp-timeout 4
    OPT: -wp-prop=tactic -wp-auto=wp:split,wp:range -wp-prover=tip,Alt-Ergo -wp-script dry
    OPT: -wp-prop=lack
  */