Update releasetools/semc_ota_from_target_files

Edited to auto-create the updater-script
Relies on the changes to the edify_generator.py

Introduced two new functions:
script.Format(param1, param2, param3)
Function for format a partition the "CWM way" (no grepping out of the fstab)

script.Symlink(param1, param2)
Function to create a single Symlink as required