libe2p: New e2p_edit_feature2 which provides better error handling

This creates a new enhanced edit_feature function for libe2p which
supports a different set of feature flags that are OK to clear as
opposed to set, and which returns more specific information about why
the user provided an invalid edit feature command.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2 files changed