Support space separated values in inline plugin parameters in remap rules

While reviewing and testing TS-2947, Leif found that, space separated values are not supported correctly for inline plugin params whereas, they work as expected when specified in the config file.

For example,

@pparam=proxy.config.foo='bar beer' results only in setting proxy.config.foo=bar

whereas

CONFIG proxy.config.foo STRING 'bar beer' results in setting proxy.config.foo='bar beer'

Further analysis revealed that the limitation is in parsing/tokenizing the input, which always treats space or tab as delimiters, regardless of whether they are included within quotes.