Change client side of t_lpback.sh configs to use inline material.

Change client side of t_lpback.sh configs to use inline material.

We have no real test rig for "inline" key material (key, cert, ca,
tls-auth, tls-crypt*) yet.   This change adds the "sample" key set
as inline config to the "loopback-client" config, while keeping
file-based configs for "loopback-server" - that way, testing both
methods of loading keys etc. in one go.

Signed-off-by: Gert Doering <gert@greenie.muc.de>
Acked-by: Antonio Quartulli <antonio@openvpn.net>
Message-Id: <20200513141147.17171-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg19883.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>