IOS: support ACL references in snmp-server group v3

[dhalperi]

Fix #5793

[batfish-bot]

This change is 

[dhalperi]

Reviewable status: 0 of 8 files reviewed, all discussions resolved (waiting on @arifogel and @progwriter)

---

projects/batfish/src/main/antlr4/org/batfish/grammar/cisco/Cisco_snmp.g4, line 108 at r1 (raw file):

:
  V3
  level = (AUTH | NOAUTH | PRIV)

FYI order did matter for these options in csr1000v.

---

projects/batfish/src/main/antlr4/org/batfish/grammar/cisco/CiscoLexer.g4, line 5169 at r1 (raw file):

   'group'
   {
     if (lastTokenType() == SNMP_SERVER) {

trying to move towards better grammar without too much work

[codecov]

Codecov Report

Merging #5810 into master will increase coverage by 0.31%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #5810      +/-   ##
============================================
+ Coverage     71.60%   71.91%   +0.31%     
- Complexity    33828    33843      +15     
============================================
  Files          2787     2789       +2     
  Lines        139909   139487     -422     
  Branches      16830    16770      -60     
============================================
+ Hits         100180   100317     +137     
+ Misses        31839    31284     -555     
+ Partials       7890     7886       -4     

Impacted Files	Coverage Δ	Complexity Δ
...tfish/representation/cisco/CiscoConfiguration.java	85.74% <ø> (-0.14%)	490.00 <0.00> (-1.00)
...fish/grammar/cisco/CiscoControlPlaneExtractor.java	65.16% <100.00%> (+0.05%)	1186.00 <3.00> (+3.00)
...fish/representation/cisco/CiscoStructureUsage.java	100.00% <100.00%> (ø)	3.00 <0.00> (ø)
...atfish/bddreachability/SessionInstrumentation.java	87.34% <0.00%> (-4.21%)	27.00% <0.00%> (-6.00%)
...col/src/main/java/org/batfish/role/InferRoles.java	89.54% <0.00%> (-1.37%)	50.00% <0.00%> (-1.00%)
...rc/main/java/org/batfish/common/BatfishLogger.java	79.33% <0.00%> (-0.67%)	37.00% <0.00%> (-1.00%)
.../main/java/org/batfish/client/config/Settings.java	80.74% <0.00%> (-0.15%)	26.00% <0.00%> (ø%)
...ient/src/main/java/org/batfish/client/Command.java	100.00% <0.00%> (ø)	11.00% <0.00%> (ø%)
...col/src/main/java/org/batfish/common/BfConsts.java	83.33% <0.00%> (ø)	1.00% <0.00%> (ø%)
... and 14 more

[progwriter]

Reviewed 8 of 8 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @arifogel)