Prevent server and domain from being undefined or blank when we need them

Improve LDAP error reporting
Don't return the str() of discovery values because it can return "None"

436130

ipa-client/ipa-install/ipa-client-install

@@ -77,12 +77,11 @@ def main():
     ds = ipaclient.ipadiscovery.IPADiscovery()
 
     ret = ds.search(domain=options.domain, server=options.server)
-    srv = ""
     if ret == -10:
         print "Can't get the fully qualified name of this host"
         print "Please check that the client is properly configured"
         return ret
-    if ret == -1:
+    if ret == -1 or not ds.getDomainName():
         logging.debug("Domain not found")
         if options.domain:
             dom = options.domain
@@ -94,7 +93,8 @@ def main():
             while dom == "":
                 dom = raw_input("Please provide your domain name (ex: example.com): ")
         ret = ds.search(domain=dom)
-    if ret == -2:
+    dom = ds.getDomainName()
+    if ret == -2 or not ds.getServerName():
         dnsok = False
         logging.debug("IPA Server not found")
         if options.server:
@@ -103,11 +103,15 @@ def main():
             return ret
         else:
             print "Failed to find the IPA Server (DNS misconfigured?)"
+            srv = ""
             while srv == "":
                 srv = raw_input("Please provide your server name (ex: ipa.example.com): ")
         ret = ds.search(domain=dom, server=srv)
+    srv = ds.getServerName()
     if ret != 0:
-        print "Failed to verify that "+srv+" is an IPA Server, aborting!"
+        print "Failed to verify that "+srv+" is an IPA Server."
+        print "This may mean that the remote server is not up or is not reachable"
+        print "due to network or firewall settings."
         return ret
 
     if dnsok: