"superuser" option for custom command "adduser"

Borreguero Calvo, Joserequested to merge
fixDuplicateSuperUser into next

Refs https://code.ornl.gov/sns-hfir-scse/reflectometry/reflectometry/-/issues/410

Description

Now that the database's volume is not removed between redeployment, we have to verify that the superuser account is already stored in the database. If this is the case, do not attempt to create the same superuser account. Instead, do nothing

Edited by Borreguero Calvo, Jose

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