Update Ember TC link policy to not generate new keys

[cdjackson]

This prevents the Ember dongle generating a new key and adding it to the key table when a device requests the key. If this is allowed, then the application must ensure that when the device leaves and rejoins, a new transient key is used, or the keytable has this entry removed or the device will not rejoin.

#701

Signed-off-by: Chris Jackson [email protected]

[codecov]

Codecov Report

Merging #703 into master will increase coverage by <.01%.
The diff coverage is 61.9%.

@@             Coverage Diff              @@
##             master     #703      +/-   ##
============================================
+ Coverage     27.87%   27.87%   +<.01%     
  Complexity     3534     3534              
============================================
  Files          1365     1365              
  Lines         49007    49022      +15     
  Branches       2116     2116              
============================================
+ Hits          13659    13667       +8     
- Misses        34723    34729       +6     
- Partials        625      626       +1

Impacted Files	Coverage Δ	Complexity Δ
.../dongle/ember/ezsp/structure/EmberCounterType.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...ee/dongle/ember/ezsp/structure/EmberKeyStatus.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...igbee/dongle/ember/ezsp/structure/EzspValueId.java	94.91% <100%> (+0.68%)	4 <0> (ø)	⬇️
...ee/dongle/ember/ezsp/structure/EzspDecisionId.java	89.18% <100%> (+0.3%)	3 <0> (ø)	⬇️
...tsystems/zigbee/dongle/ember/ZigBeeDongleEzsp.java	50.42% <100%> (+0.1%)	46 <0> (ø)	⬇️
.../zigbee/app/discovery/ZigBeeNetworkDiscoverer.java	77.24% <0%> (-0.53%)	18% <0%> (ø)

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