e-server: Determine default HDF XML file from path relative to e-server binary

* src/main.cpp (getDefaultHdfFile):
New function. Use path relative to the e-server binary to determine
default XML HDF file path.
(main): Get default HDF file from getDefaultHdfFile() if user did not
explicitly specify it with "-hdf".
Remove all sudo wrapper scripts.

* src/e-server/e-server.sh:
* src/e-utils/e-hw-rev/e-hw-rev.sh:
* src/e-utils/e-loader/e-loader.sh:
* src/e-utils/e-read/e-read.sh:
* src/e-utils/e-reset/e-reset.sh:
* src/e-utils/e-reset/run.sh:⏎
* src/e-utils/e-write/e-write.sh:
Delete. Thanks to the Epiphany device driver these are unnecessary.