Error importing Public Key in Keyring.

[jgimeno]

Summary of Bug

There is a problem when trying to import a Public key into the Keyring that was generated with old Keyring which were saved in database.

Version

Steps to Reproduce

pubkeyArmor, err := legacyKb.ExportPubKey(keyName)
if err != nil {
    return err
}

if err := keyring.ImportPubKey(keyName, pubkeyArmor); err != nil {
    return err
}

We export the Public Key from a legacykb and import it back in the new keyring.

The new Keyring uses internally:

	pubKey, err := legacy.PubKeyFromBytes(pubBytes)
	if err != nil {
		return err
	}

Which gives the error:

unmarshal to types.PubKey failed after 4 bytes (unrecognized prefix bytes 02669815): 0266981512EBBCDE96BB024594135859F81A967E0CDDBC620C23420DC92F11F061

Probably related to: #7987

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[alessio]

CC'ing @chengwenxi @fedekunze

[alessio]

@zmanian

[sahith-narahari]

Fixed in #8436