testing: Globally define logging via syslog for charon-systemd

We could make the same change for charon (actually setting it for charon
in strongswan.conf.testing would work for charon-systemd too), however,
there are dozens of test cases that currently set charondebug in
ipsec.conf.

testing/tests/libipsec/net2net-cert/hosts/moon/etc/strongswan.conf

@@ -1,19 +1,10 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 swanctl {
-  load = pem pkcs1 x509 revocation constraints pubkey openssl random 
+  load = pem pkcs1 x509 revocation constraints pubkey openssl random
 }
 
 charon-systemd {
   load = random nonce aes sha1 sha2 gcm pem pkcs1 curve25519 gmp x509 curl revocation hmac vici kernel-libipsec kernel-netlink socket-default updown
-
-  syslog {
-    daemon {
-      default = 1
-    }
-    auth {
-      default = 0
-    }
-  }
   multiple_authentication = no
 }

testing/tests/libipsec/net2net-cert/hosts/sun/etc/strongswan.conf

@@ -1,19 +1,10 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 swanctl {
-  load = pem pkcs1 x509 revocation constraints pubkey openssl random 
+  load = pem pkcs1 x509 revocation constraints pubkey openssl random
 }
 
 charon-systemd {
   load = random nonce aes sha1 sha2 gcm pem pkcs1 curve25519 gmp x509 curl revocation hmac vici kernel-libipsec kernel-netlink socket-default updown
-
-  syslog {
-    daemon {
-      default = 1
-    }
-    auth {
-      default = 0
-    }
-  }
   multiple_authentication = no
 }