switch to sclient for learning spam

spamassassin/files/sa-learn-ham.sh

 #!/bin/sh
-exec /usr/bin/sa-learn -u ${1} --ham
+# you can also use tcp/ip here, consult spamc(1)
+exec /usr/bin/spamc -u ${1} -L ham -C report
+
 

spamassassin/files/sa-learn-spam.sh

 #!/bin/sh
-exec /usr/bin/sa-learn -u ${1} --spam
+# you can also use tcp/ip here, consult spamc(1)
+exec /usr/bin/spamc -u ${1} -L spam -C report