Added an option to rename the ipsec script during installation

Also rename the man page and adjust all references in the script, the
man page and other files.

Closes #194.

init/systemd/Makefile.am

@@ -5,4 +5,7 @@ CLEANFILES = strongswan.service
 systemdsystemunit_DATA = strongswan.service
 
 strongswan.service : strongswan.service.in
-	sed -e "s:@SBINDIR@:$(sbindir):" $(srcdir)/$@.in > $@
+	sed \
+	-e "s:@SBINDIR@:$(sbindir):" \
+	-e "s:@IPSEC_SCRIPT@:$(ipsec_script):" \
+	$(srcdir)/$@.in > $@

init/systemd/strongswan.service.in

@@ -3,7 +3,7 @@ Description=strongSwan IPsec
 After=syslog.target
 
 [Service]
-ExecStart=@SBINDIR@/ipsec start --nofork
+ExecStart=@SBINDIR@/@IPSEC_SCRIPT@ start --nofork
 StandardOutput=syslog
 
 [Install]