configure: Load fetcher plugins after crypto base plugins

Some fetcher plugins (such as curl) might build upon OpenSSL to implement
HTTPS fetching. As we set (and can't unset) threading callbacks in our
openssl plugin, we must ensure that OpenSSL functions don't get called after
openssl plugin unloading.

We achieve that by loading curl and all other fetcher plugins after the base
crypto plugins, including openssl.

testing/tests/tnc/tnccs-20-pts-no-ecc/hosts/moon/etc/strongswan.conf

@@ -1,7 +1,7 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 charon {
-  load = curl aes md5 sha1 sha2 hmac gmp pem pkcs1 random nonce x509 revocation stroke kernel-netlink socket-default eap-identity eap-ttls eap-md5 eap-tnc tnc-imv tnc-tnccs tnccs-20 updown sqlite
+  load = aes md5 sha1 sha2 hmac gmp pem pkcs1 random nonce x509 curl revocation stroke kernel-netlink socket-default eap-identity eap-ttls eap-md5 eap-tnc tnc-imv tnc-tnccs tnccs-20 updown sqlite
 
   multiple_authentication = no
 
@@ -30,4 +30,3 @@ attest {
   load = random nonce openssl sqlite
   database = sqlite:///etc/pts/config.db
 }
-