Commits on Aug 30, 2021

1. pkg/fqdn: use LRU in FQDN policy calculation …

   Using an LRU for the memory-intensive operations such as regex.Compile
   bring some benefits as presented in the following benchmarks [1]. These
   benchmarks assumed there were 2 CNPs that shared 100 FQDN
   `matchPattern` on a node with 20 endpoints.
   
   [1]
   ```
   name                             old time/op    new time/op    delta
   _perEPAllow_setPortRulesForID-8    13.9ms ± 6%     1.2ms ±63%  -91.10%  (p=0.008 n=5+5)
   
   name                             old alloc/op   new alloc/op   delta
   _perEPAllow_setPortRulesForID-8    17.4MB ± 0%     0.6MB ± 0%  -96.56%  (p=0.008 n=5+5)
   
   name                             old allocs/op  new allocs/op  delta
   _perEPAllow_setPortRulesForID-8     42.8k ± 0%      8.1k ± 0%  -81.13%  (p=0.008 n=5+5)
   ```
   
   Signed-off-by: André Martins <andre@cilium.io>

   

   aanm authored and pchaigno committed Aug 30, 2021
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