[sr-dev] [kamailio/kamailio] tls: allow export session keys (#2785)

[sergey-safarov]

To free memory applied patch
```diff
--- a/src/modules/tls/tls_init.c
+++ b/src/modules/tls/tls_init.c
@@ -627,8 +627,9 @@ int prepare_keylog_file(str session_keylog_filename)
        * the tool is run multiple times.
        */
        bio_keylog = BIO_new_file(keylog_file, "a");
+       pkg_free(keylog_file);
        if (bio_keylog == NULL) {
-               LOG(tls_log, "Error writing keylog file: %s\n", keylog_file);
+               LOG(tls_log, "Error writing keylog file: %.*s\n", session_keylog_filename.len, session_keylog_filename.s);
                return 1;
        }
 
```
As session keys may be refreshed during TLS session, then the file open and close operation needs use on each `keylog_callback`.
Will it be trick on a server with a lot of connected TLS clients?

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