Renamed dbh subroutines and variables for clarity

In moving from DBI to DBIx::Class, we at first left the various
variables the same.  This goes through to update them for the proper
names.

* Wallet::Admin::schema was created to return the schema object (and
similarly for Wallet::Server and Wallet::Report).
* Wallet::Admin::dbh was modified to return the actual DBI handle again
(and similarly for Wallet::Server and Wallet::Report).
* Various places that used $admin->{dbh} were moved to $admin->{schema}.
* Various places using $dbh for the schema object were changed to
$schema.

Change-Id: I00914866e9a8250855a7828474aa9ce0f37b914f
Reviewed-on: https://gerrit.stanford.edu/733
Reviewed-by: Russ Allbery <rra@stanford.edu>
Tested-by: Russ Allbery <rra@stanford.edu>

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