tools: hv: change http to https in hv_kvp_daemon.c

Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.

Deterministic algorithm:
For each file:
  If not .svg:
    For each line:
      If doesn't contain `\bxmlns\b`:
        For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
          If both the HTTP and HTTPS versions
          return 200 OK and serve the same content:
            Replace HTTP with HTTPS.

Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de>
Link: https://lore.kernel.org/r/20200705214457.28433-1-grandmaster@al2klimov.de
[ wei: change subject line to be more specific ]
Signed-off-by: Wei Liu <wei.liu@kernel.org>

Author: Al2Klimov

tools/hv/hv_kvp_daemon.c

@@ -437,7 +437,7 @@ void kvp_get_os_info(void)
 
 	/*
 	 * Parse the /etc/os-release file if present:
-	 * http://www.freedesktop.org/software/systemd/man/os-release.html
+	 * https://www.freedesktop.org/software/systemd/man/os-release.html
 	 */
 	file = fopen("/etc/os-release", "r");
 	if (file != NULL) {