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/gcrypt-ikev1/alg-serpent/hosts/carol/etc/strongswan.conf

@@ -6,14 +6,5 @@ swanctl {
 
 charon-systemd {
   load = nonce pem pkcs1 gcrypt hmac x509 revocation curl vici kernel-netlink socket-default
-
-  syslog {
-    daemon {
-      default = 1
-    }
-    auth {
-      default = 0
-    }
-  }
   send_vendor_id = yes
 }

testing/tests/gcrypt-ikev1/alg-serpent/hosts/moon/etc/strongswan.conf

@@ -6,14 +6,5 @@ swanctl {
 
 charon-systemd {
   load = nonce pem pkcs1 gcrypt hmac x509 revocation vici kernel-netlink socket-default
-
-  syslog {
-    daemon {
-      default = 1
-    }
-    auth {
-      default = 0
-    }
-  }
   send_vendor_id = yes
 }

testing/tests/gcrypt-ikev1/alg-twofish/hosts/carol/etc/strongswan.conf

@@ -6,14 +6,5 @@ swanctl {
 
 charon-systemd {
   load = nonce pem pkcs1 gcrypt hmac x509 revocation curl vici kernel-netlink socket-default
-
-  syslog {
-    daemon {
-      default = 1
-    }
-    auth {
-      default = 0
-    }
-  }
   send_vendor_id = yes
 }

testing/tests/gcrypt-ikev1/alg-twofish/hosts/moon/etc/strongswan.conf

@@ -6,14 +6,5 @@ swanctl {
 
 charon-systemd {
   load = nonce pem pkcs1 gcrypt hmac x509 revocation vici kernel-netlink socket-default
-
-  syslog {
-    daemon {
-      default = 1
-    }
-    auth {
-      default = 0
-    }
-  }
   send_vendor_id = yes
 }