Add support for backing up new schema setup of Postgres DB for Eucalyptus 4.1

[hspencer77]

In Eucalyptus 4.1, the database has a different layout (see EUCA-9617). Layout in 4.1 is as follows:

              List of schemas
             Name              |   Owner
-------------------------------+------------
 eucalyptus_auth               | eucalyptus
 eucalyptus_autoscaling        | eucalyptus
 eucalyptus_cloud              | eucalyptus
 eucalyptus_cloudformation     | eucalyptus
 eucalyptus_cloudwatch         | eucalyptus
 eucalyptus_cloudwatch_backend | eucalyptus
 eucalyptus_config             | eucalyptus
 eucalyptus_dns                | eucalyptus
 eucalyptus_faults             | eucalyptus
 eucalyptus_general            | eucalyptus
 eucalyptus_imaging            | eucalyptus
 eucalyptus_loadbalancing      | eucalyptus
 eucalyptus_osg                | eucalyptus
 eucalyptus_records            | eucalyptus
 eucalyptus_reporting          | eucalyptus
 eucalyptus_reporting_backend  | eucalyptus
 eucalyptus_simpleworkflow     | eucalyptus
 eucalyptus_storage            | eucalyptus
 eucalyptus_walrus             | eucalyptus
 public                        | eucalyptus

Since this is the case, dumps from the database need to be done per schema. For example:

# pg_dump -p 8777  -h /var/lib/eucalyptus/db/data -n  eucalyptus_autoscaling eucalyptus_shared

This update needs to occur in the eucadb module.

[aveekbu]

/usr/pgsql-9.2/bin/pg_dump -c -o -h /var/lib/eucalyptus/db/data -p 8777 -U root eucalyptus_shared -n eucalyptus_walrus -> work like charm. Only change needed to bring is pgsql9.2 and "eucalyptus_shared -n" with existing :)

[hspencer77]

Fixed by PR #79