classes/sstate: Update output hash

classes/sstate: Update output hash

Updates the output hash calculation for determining if tasks are
equivalent. The new algorithm does the following based on feedback:
 1) The output hash function was moved to the OE library.
 2) All files are printed in a single line tabular format
 3) Prints the file type and mode in a user-friendly ls-like format
 4) Includes the file owner and group (by name, not ID). These are only
    included if the task is run under pseudo since that is the only time
    they can be consistently determined.
 5) File size is included for regular files

(From OE-Core rev: 4bd297dfe92851f3b44f6b5560bac9d8f9ccf9f2)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>