Dynamips needed its own NIO base class extended with a `_markers`
attribute and `markers` property (mirroring the existing `filters`
pattern), plus marker propagation from the controller-supplied NIO
settings through NIOUDP.create/update to the common destination
NIO that base_node._ubridge_apply_markers reads.
Cloud simply needed the missing _ubridge_apply_markers calls after
_ubridge_apply_filters in its two ubridge connection methods, same
pattern as the earlier docker fix.
Both types are now added back to _MARKER_CAPABLE_TYPES.
Mark Paronyan
YueGuobin
grossmj
Julien Duponchelle