Ignore VLANs with non-numerical tags in Juniper NETCONF responses.

[lunkwill42]

PortAdmin only cares about VLANs that can be identified through a proper 12-bit integer tag, so it should be safe to ignore ones that do not conform to the expected response from Juniper switches.

Fixes #2452

[sonarqubecloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov[bot]]

Codecov Report

Merging #2453 (b9c769b) into master (26c69f1) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2453      +/-   ##
==========================================
+ Coverage   52.72%   52.76%   +0.03%     
==========================================
  Files         552      552              
  Lines       40186    40186              
==========================================
+ Hits        21190    21204      +14     
+ Misses      18996    18982      -14     

Impacted Files	Coverage Δ
python/nav/portadmin/napalm/juniper.py	40.34% <100.00%> (+6.00%)	:arrow_up:

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Test results

     12 files       12 suites   13m 59s :stopwatch: 3 089 tests 2 993 :heavy_check_mark:   96 :zzz: 0 :x: 8 742 runs  8 454 :heavy_check_mark: 288 :zzz: 0 :x:

Results for commit b9c769b7.