Feature: libpe_status: Drop support for nodes with invalid type

Previously, if a node had an unrecognized type in the CIB (that is, some
string other than "member", "remote", or "ping"), we would create a ping
node by default and log a warning.

Now, log an error and ignore the node entry.

Closes T863

Signed-off-by: Reid Wahl <nrwahl@protonmail.com>