[horde] New install using Git and composer missing horde_* tables

[Bill Campbell]

I've been trying to set horde using horde-git-tools with a postgresql-10.3
database, getting through the first stages to the configuration screen.
The first time running this is complains about the database migration files
do not exist PEAR data_dir.  The command pear config-get data_dir returns
the correct directory, and permissions look OK.

After going through the basic horde configuration, defining the database
connection, and saving the horde configuration starting with an empty
database, the horde database is largely populated, except that none of the
horde_* tables have been created.

Running bin/horde-db-migrate completes normally, but still no horde_prefs
or other horde_* tables.

Life was simpler when I started using horde-3.1.5 in 2007 as there were
nice sql scripts easily available to handle the database setup and
migration.

Bill
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