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/swanctl/frags-ipv6/hosts/carol/etc/strongswan.conf

@@ -8,13 +8,4 @@ charon-systemd {
   load = pem pkcs1 x509 revocation constraints pubkey openssl random nonce curl kernel-netlink socket-default updown vici
 
   fragment_size = 1400
-
-  syslog {
-    daemon {
-      default = 1
-    }
-    auth {
-      default = 0
-    }
-  }
 }

testing/tests/swanctl/frags-ipv6/hosts/dave/etc/strongswan.conf

@@ -8,13 +8,4 @@ charon-systemd {
   load = pem pkcs1 x509 revocation constraints pubkey openssl random nonce curl kernel-netlink socket-default updown vici
 
   fragment_size = 1400
-
-  syslog {
-    daemon {
-      default = 1
-    }
-    auth {
-      default = 0
-    }
-  }
 }

testing/tests/swanctl/frags-ipv6/hosts/moon/etc/strongswan.conf

@@ -8,13 +8,4 @@ charon-systemd {
   load = pem pkcs1 x509 revocation constraints pubkey openssl random nonce curl kernel-netlink socket-default updown vici
 
   fragment_size = 1400
-
-  syslog {
-    daemon {
-      default = 1
-    }
-    auth {
-      default = 0
-    }
-  }
 }