Replace functions in utils with oslo.fileutils

The following functions have moved to oslo.
remove_path_on_error
file_open
delete_if_exists

Replaced/removed overlapping functions with the ones in fileutils

Change-Id: I41a19d76a777b6f899843bb0cc0582630accbd5c
Merge "Replace functions in utils with oslo.fileutils"
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp