SHDP-238 Fix store file naming with codec

File name is now set if codec is used together with
CodecFileNamingStrategy. Also added a simple
test case to verify this behaviour.
SHDP-239 Add support for reading/writing delimited fields

This is now meant to write and read csv, tab or some other
custom data where fields are also delimited.

For example DelimitedTextFileWriter is using existing TextFileWriter
and just adds logic for delimiting of fields.
placeholders for yarn conditions
Merge branch 'master' into boot