[#526,!269] Addressed more review comments

[#526,!269] Addressed more review comments

src/lib/cql/testutils/cql_schema.*
    Modified to use common softWipeEnabled(), which
    defaults to true

src/lib/database/testutils/schema.*
    bool softWipeEnabled() - new function that checks
    env varible to determine if DB data wiping is enabled
    (default is true/enabled)

src/lib/mysql/testutils/mysql_schema.*
    createMySQLSchema()
    destroyMySQLSchema()-  now softWipeEnabled() to allow
    data wiping to be turned on/off

src/share/database/scripts/mysql/wipe_data.sh.in
    Added better error messaging

several files:
    Removed extraneous calls to destroyMySQLSchema, added
    comments