Junos: parse if-route-exists ip address

[SirasornT]

This PR modifies the Junos parser grammar so that if-route-exists can parse IPv4 and IPv6 addresses, following the documentation https://www.juniper.net/documentation/us/en/software/junos/cli-reference/topics/ref/statement/if-route-exists-edit-policy-options-condition.html.

The test file uses IPv4 and IPv6 prefix reserved for documentation and testing (RFC5737 and RFC3849)

[batfish-bot]

This change is 

[SLarkworthy]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @SirasornT)

[SLarkworthy]

Actually, can you add an extraction test as well? That these are extracted with the /32, /128?

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @SirasornT)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.16%. Comparing base (ae33bc8) to head (21be114).
Report is 52 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9353      +/-   ##
==========================================
- Coverage   73.17%   73.16%   -0.02%     
==========================================
  Files        3321     3321              
  Lines      169206   169206              
  Branches    20112    20112              
==========================================
- Hits       123812   123794      -18     
- Misses      36288    36302      +14     
- Partials     9106     9110       +4     

see 10 files with indirect coverage changes

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[SLarkworthy]

Reviewed 2 of 2 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @SirasornT)