What

This MR allows the block validator to gracefully shutdown on Context error and not only on unknown inode error.

This MR is necessary for a better mitigation that will come later.

Why

To avoid having a zombie node on context error

Document the interface of any function added or modified (see the coding guidelines)
Document any change to the user interface, including configuration parameters (see node configuration)
Provide automatic testing (see the testing guide).
For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
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