Fix rake db:structure:dump on Postgres when multiple schemas are used.

If postgresql is being used and there are multiple schemas listed on the
`schema_search_path`, then `structure.sql` dumps (triggered by `rake
db:structure:dump` or `config.active_record.schema_format = :sql`) began
failing in Rails 4.2.5.

This is due to the changes made in
https://github.com/rails/rails/pull/17885 The problem is that multiple
schemas were getting getting passed to `Kernel.system` as a single,
space delimited string argument (for example, "--schema=foo
--schema=bar"). However, with the updated array style of calling
`Kernel.system`, these need to be passed as separate arguments (for
example, "--schema=foo", "--schema=bar"). If they get passed as a single
string, then the underlying pg_dump program isn't sure how to interpret
that single argument and you'll get an error reporting: "pg_dump: No
matching schemas were found"

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