utils: rewrite ogExtendFs

Drop subprocess call to bash function ogExtendFs. Use a native python
solution with subprocess calls to the required underlying tools.

Use get_filesystem_type to get the present filesystem from a partition
and call the corresponding filesystem grow function.

Filesystem specific functions are declared "_extend_{filesystem}" and
should not be imported elsewhere.

Each filesystem specific function wraps a subprocess call to the
required underlying program:

- NTFS filesystems: "ntfsresize -f [partition]"
- ext4 filesystems: "resize2fs -f [partition]"

Set NTFS related subprocess stdin to 'y' because human input cannot be
unset with other ntfsresize parameters.

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