Extend the timeout for SNI DTLS tests

The following tests were timing out under valgrind so now have a much
longer timeout:
    SNI: DTLS, CA no override
    SNI: DTLS, CA override with CRL
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index f3b978a..a8adf9b 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -2474,6 +2474,7 @@
             -c "skip write certificate verify" \
             -s "skip parse certificate verify"
 
+needs_more_time 4
 run_test    "SNI: DTLS, CA no override" \
             "$P_SRV debug_level=3 auth_mode=optional dtls=1 \
              crt_file=data_files/server5.crt key_file=data_files/server5.key \
@@ -2510,6 +2511,7 @@
             -S "! The certificate is not correctly signed by the trusted CA" \
             -S "The certificate has been revoked (is on a CRL)"
 
+needs_more_time 4
 run_test    "SNI: DTLS, CA override with CRL" \
             "$P_SRV debug_level=3 auth_mode=optional \
              crt_file=data_files/server5.crt key_file=data_files/server5.key dtls=1 \