CLEANUP: assorted typo fixes in the code and comments

These are mostly comments in the code. A few error messages were fixed
and are of low enough importance not to deserve a backport. Some regtests
were also fixed.
diff --git a/include/proto/connection.h b/include/proto/connection.h
index ecc03de..2118d23 100644
--- a/include/proto/connection.h
+++ b/include/proto/connection.h
@@ -681,7 +681,7 @@
 	case CO_ER_SSL_TIMEOUT:   return "Timeout during SSL handshake";
 	case CO_ER_SSL_TOO_MANY:  return "Too many SSL connections";
 	case CO_ER_SSL_NO_MEM:    return "Out of memory when initializing an SSL connection";
-	case CO_ER_SSL_RENEG:     return "Rejected a client-initiated SSL renegociation attempt";
+	case CO_ER_SSL_RENEG:     return "Rejected a client-initiated SSL renegotiation attempt";
 	case CO_ER_SSL_CA_FAIL:   return "SSL client CA chain cannot be verified";
 	case CO_ER_SSL_CRT_FAIL:  return "SSL client certificate not trusted";
 	case CO_ER_SSL_MISMATCH:  return "Server presented an SSL certificate different from the configured one";