Rename quota_injected_file_path_bytes

Rename quota_injected_file_path_bytes to
quota_injected_file_path_length, and change help message to
'Length of injected file path'.

DocImpact

Change-Id: Id6b9c03b37664601937e4bc9d4a8d8026c4d3b63
Closes-bug: 1258175
Merge "Rename quota_injected_file_path_bytes"