TODO and @deprecation cleanup

[tzaeschke]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files	Coverage Δ	Complexity Δ
...n/java/org/scion/jpan/AbstractDatagramChannel.java	82.98% <ø> (ø)	74.00 <0.00> (ø)
.../main/java/org/scion/jpan/ScionDatagramSocket.java	54.96% <ø> (ø)	57.00 <0.00> (ø)
src/main/java/org/scion/jpan/ScmpChannel.java	85.14% <ø> (ø)	18.00 <0.00> (ø)
...ava/org/scion/jpan/internal/ScionBootstrapper.java	75.65% <ø> (ø)	29.00 <0.00> (ø)