Use default db port if one is not specified.

[mattmix]

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Description

The documentation indicates that SMD_DBHOST has a default port of 5432, but if it is not specified on the command line or environment the command will error out and print usage. This change just sets the default port if not otherwise set.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

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[alexlovelltroy]

LGTM