Verify the --ip-address option when setting up DNS.

There was a corner case where the value of --ip-address was never verified
if you were also setting up DNS.

Added this bit of information to the man page too.

ticket 399

install/tools/ipa-server-install

@@ -598,6 +598,8 @@ def main():
 
     if options.ip_address and options.ip_address != ip:
         if options.setup_dns:
+            if not verify_ip_address(options.ip_address):
+                return 1
             ip = options.ip_address
         else:
             print >>sys.stderr, "Error: the hostname resolves to an IP address that is different"

install/tools/man/ipa-server-install.1

@@ -53,7 +53,7 @@ Configure a self\-signed CA instance for issuing server certificates instead of
 The fully\-qualified DNS name of this server
 .TP
 \fB\-\-ip\-address\fR=\fIIP_ADDRESS\fR
-The IP address of this server
+The IP address of this server. If this address does not match the address the host resolves to and --setup-dns is not selected the installation will fail.
 .TP
 \fB\-U\fR, \fB\-\-unattended\fR
 An unattended installation that will never prompt for user input