Merge lp:~percona-toolkit-dev/percona-toolkit/pt-osc-requests-password-twice-1286250 into lp:~percona-toolkit-dev/percona-toolkit/release-2.2.8

[Frank Cizmich]

Modified Cxn in pt-osc to inherit password from other dsn, without asking for it again.
Works for empty passwords too.

[Daniel Nichter (daniel-nichter)]

review: Approve

=== modified file 'bin/pt-online-schema-change'
--- bin/pt-online-schema-change	2014-04-24 17:38:02 +0000
+++ bin/pt-online-schema-change	2014-05-28 20:18:09 +0000
@@ -3771,7 +3771,7 @@
 
    my $dbh = $self->{dbh};
    if ( !$dbh || !$dbh->ping() ) {
-      if ( $self->{ask_pass} && !$self->{asked_for_pass} ) {
+      if ( $self->{ask_pass} && !$self->{asked_for_pass} && !defined $dsn->{p}) {
          $dsn->{p} = OptionParser::prompt_noecho("Enter MySQL password: ");
          $self->{asked_for_pass} = 1;
       }