BUG/MEDIUM: ssl/crt-list: correctly insert crt-list line if crt already loaded

In issue #940, it was reported that the crt-list does not work correctly
anymore. Indeed when inserting a crt-list line which use a certificate
previously seen in the crt-list, this one won't be inserted in the SNI
list and will be silently ignored.

This bug was introduced by commit  47da821 "MEDIUM: ssl: emulates the
multi-cert bundles in the crtlist".

This patch also includes a reg-test which tests this issue.

This bugfix must be backported in 2.3.
diff --git a/src/ssl_crtlist.c b/src/ssl_crtlist.c
index 65ca289..5f5942b 100644
--- a/src/ssl_crtlist.c
+++ b/src/ssl_crtlist.c
@@ -598,6 +598,12 @@
 					}
 				}
 			}
+		} else {
+			entry->node.key = ckchs;
+			entry->crtlist = newlist;
+			ebpt_insert(&newlist->entries, &entry->node);
+			LIST_ADDQ(&newlist->ord_entries, &entry->by_crtlist);
+			LIST_ADDQ(&ckchs->crtlist_entry, &entry->by_ckch_store);
 		}
 		entry = NULL;
 	}