board/common: relocate mkcert and fix openssl v3 x509 output

Not for public consumption.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

board/common/rootfs/etc/finit.d/available/mkcert.conf

@@ -1 +1 @@
-task [S] <service/confd/ready> mkcert -- Verifying self-signed https certificate
+task [S] <service/confd/ready> /libexec/infix/mkcert -- Verifying self-signed https certificate

board/common/rootfs/libexec/infix/mkcert

@@ -30,7 +30,7 @@ generate()
 	    --out-certificate $CRT --out-key $KEY
 }
 
-CN=$(openssl x509 -noout -subject -in "${CRT}" 2>/dev/null |sed 's/.*CN = //')
+CN=$(openssl x509 -noout -subject -in "${CRT}" 2>/dev/null |sed 's/.*CN=//')
 if [ -z "$CN" ] || [ "$CN" != "$cn" ]; then
     generate "$cn"
 fi