use auth_handler to specify host header value if possible
a more robust test for the function
re-factored patch to make it more testable, added unit test
Fixed bug when arg==0 (issue #1886)
Changed backup_retention_period type to int (as in AWS doc). Tests updated.
sdbadmin: Added option for sorting SDB dumps

Currently works only for JSON dumps.
Merge pull request #1862 from dkavanagh/fix-v4-host-header

Use auth_handler to specify host header value including custom ports if possible, which are used by Eucalyptus. Fixes #1862.
Merge pull request #1887 from juanfont/develop

Fix ignored RDS backup_retention_period when value was 0. Fixes #1887, #1886.
Merge pull request #1888 from itoshkov/feature/sdb-dump-sort

Add option for sorting SDB dumps to sdbadmin. Fixes #1888.