Ignore or add strict matches.

Resolves:

riak_kv_console.erl:285: Expression produces a value of type [['ok']], but this value is unmatched
riak_kv_console.erl:227: Expression produces a value of type 'nop' | 'ok' | {'error',_}, but this value is unmatched
Ensure load_file succeeds.

Resolves:

riak_kv_console.erl:299: Expression produces a value of type {'error','badfile' | 'native_code' | 'nofile' | 'not_purged' | 'on_load' | 'sticky_directory'} | {'module',atom() | tuple()}, but this value is unmatched