[SPARK-4556] [BUILD] binary distribution assembly can't run in local mode
[SPARK-4556] [BUILD] binary distribution assembly can't run in local mode

Add note on building a runnable distribution with make-distribution.sh

Author: Sean Owen <291c18f3fb7528c712d9098b0e50a515ea0b91d5@cloudera.com>

Closes #6186 from srowen/SPARK-4556 and squashes the following commits:

4002966 [Sean Owen] Add pointer to --help flag
9fa7883 [Sean Owen] Add note on building a runnable distribution with make-distribution.sh

(cherry picked from commit 1fd33815f47478f5f2e8b55b90757819b8cb5247)
Signed-off-by: Sean Owen <291c18f3fb7528c712d9098b0e50a515ea0b91d5@cloudera.com>

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