Add ability to create DontFragmentAttribute attribute from a factory

[sdubov]

No description provided.

[jitsi-jenkins]

Hi, thanks for your contribution!
If you haven't already done so, could you please make sure you sign our CLA (https://jitsi.org/icla for individuals and https://jitsi.org/ccla for corporations)? We would unfortunately be unable to merge your patch unless we have that piece :(.

[codecov]

Codecov Report

Merging #243 (2d196ef) into master (64a7ca8) will increase coverage by 0.15%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #243      +/-   ##
============================================
+ Coverage     38.60%   38.75%   +0.15%     
- Complexity     1351     1355       +4     
============================================
  Files           178      178              
  Lines         12142    12144       +2     
  Branches       1836     1836              
============================================
+ Hits           4688     4707      +19     
+ Misses         6802     6788      -14     
+ Partials        652      649       -3     

Impacted Files	Coverage Δ
...ain/java/org/ice4j/attribute/AttributeFactory.java	42.85% <0.00%> (-0.74%)	⬇️
src/main/java/org/ice4j/stack/TransactionID.java	81.03% <0.00%> (-5.18%)	⬇️
...in/java/org/ice4j/ice/ConnectivityCheckClient.java	55.62% <0.00%> (-2.44%)	⬇️
...in/java/org/ice4j/stack/StunClientTransaction.java	81.55% <0.00%> (-1.95%)	⬇️
src/main/java/org/ice4j/ice/CandidatePair.java	67.91% <0.00%> (-1.50%)	⬇️
src/main/java/org/ice4j/message/Message.java	49.81% <0.00%> (-0.74%)	⬇️
...c/main/java/org/ice4j/pseudotcp/PseudoTCPBase.java	64.16% <0.00%> (+0.31%)	⬆️
.../java/org/ice4j/pseudotcp/PseudoTcpSocketImpl.java	65.99% <0.00%> (+0.57%)	⬆️
src/main/java/org/ice4j/util/PeriodicRunnable.java	75.75% <0.00%> (+1.51%)	⬆️
src/main/java/org/ice4j/ice/Agent.java	56.41% <0.00%> (+1.60%)	⬆️
... and 4 more

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