REGTESTS: quic: show_ssl_ocspresponse.vtc supported by QUIC

REGTESTS: quic: show_ssl_ocspresponse.vtc supported by QUIC

ssl/show_ssl_ocspresponse.vtc was renamed to ssl/show_ssl_ocspresponse.vtci
to produce a common part runnable both for QUIC and TCP listeners.
Then show_ssl_ocspresponse.vtc files were created both under ssl and quic directories
to call this .vtci file with correct VTC_SOCK_TYPE environment values
("quic" for QUIC listeners and "stream" for TCP listeners);