formatted and refactored s3 blobstore client spec

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
make sure that s3_force_path_style blobstore option is false by default in code
added spacing to director.yml.yml.erb
formatting
specify s3_force_path_style configuration (default false) for director blobstore
use blobstore.s3_port instead of blobstore.port for configuring custom s3 blobstore port

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>