Satellite 6 Running `cpdb` or `foreman-maintain upgrade check` failed on candlepin-validate-db

Issue

• Running the "Checking the Candlepin database step" from the "Upgrading Red Hat Satellite" guide returns an error.
• Running the upgrade check command throws an error for [candlepin-validate-db]

# foreman-maintain upgrade check --target-version 6.3
Running Checks before upgrading to Satellite 6.3
================================================================================
Check for paused tasks:                                               [OK]
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Check whether all services are running using hammer ping:             [OK]
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Check to validate candlepin database:                                 [FAIL]
Failed executing /usr/share/candlepin/cpdb --validate --verbose -u 'candlepin' -p '[FILTERED]', exit status 1:
 ########## ERROR ############
Error running command: liquibase --driver=org.postgresql.Driver --classpath=/usr/share/java/postgresql-jdbc.jar:/var/lib/tomcat/webapps/candlepin/WEB-INF/classes/ --changeLogFile=db/changelog/changelog-validate.xml --url=jdbc:postgresql:candlepin --username=candlepin --password=[FILTERED] --logLevel=debug migrate -Dcommunity=False
Status code: 65280
Command output: DEBUG 2/23/18 9:31 AM:liquibase: Connected to candlepin@jdbc:postgresql:candlepin
DEBUG 2/23/18 9:31 AM:liquibase: Setting auto commit to false from true
DEBUG 2/23/18 9:31 AM:liquibase: Executing QUERY database command: select count(*) from public.databasechangeloglock
DEBUG 2/23/18 9:31 AM:liquibase: Executing QUERY database command: SELECT LOCKED FROM public.databasechangeloglock WHERE ID=1
DEBUG 2/23/18 9:31 AM:liquibase: Lock Database
[...]
--driver=org.postgresql.Driver --classpath=/usr/share/java/postgresql-jdbc.jar:/var/lib/tomcat/webapps/candlepin/WEB-INF/classes/ --changeLogFile=db/changelog/changelog-validate.xml --url=jdbc:postgresql:candlepin --username=candlepin --password=[FILTERED] --logLevel=debug
Traceback (most recent call last):
  File "/usr/share/candlepin/cpdb", line 297, in <module>
    dbsetup.validate()
  File "/usr/share/candlepin/cpdb", line 70, in validate
    self._run_liquibase("db/changelog/changelog-validate.xml")
  File "/usr/share/candlepin/cpdb", line 106, in _run_liquibase
    output = run_command("liquibase %s migrate -Dcommunity=%s" % (liquibase_options, self.community))
  File "/usr/share/candlepin/cpdb", line 38, in run_command
    error_out(command, status, output)
  File "/usr/share/candlepin/cpdb", line 46, in error_out
    raise Exception("Error running command")
Exception: Error running command
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Check for running tasks:                                              [OK]
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Check for old tasks in paused/stopped state:                          [OK]
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Check for pending tasks which are safe to delete:                     [OK]
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Check for tasks in planning state:                                    [OK]
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Check for recommended disk speed of pulp, mongodb, pgsql dir.: 
/ Finished                                                                      

Disk speed : 242 MB/sec                                               [OK]
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Scenario [Checks before upgrading to Satellite 6.3] failed.

The following steps ended up in failing state:

  [candlepin-validate-db]