js: DriverRemoteConnection: allow custom agent

[itsjfx]

Allow users to provide their own http.Agent when initialising DriverRemoteConnection.

This is extremely helpful connecting to databases within a corporate network.
This is utilising the agent support provided by the ws library

Usage with a SOCKS proxy with socks-proxy-agent:

const { SocksProxyAgent } = require('socks-proxy-agent');
const agent = new SocksProxyAgent(
    'socks://127.0.0.1:1080'
);
const dc = new DriverRemoteConnection('wss://xx:8182/gremlin', { agent });

[codecov-commenter]

Codecov Report

Merging #2240 (599f3b7) into master (2bcdb66) will decrease coverage by 0.32%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2240      +/-   ##
============================================
- Coverage     76.11%   75.79%   -0.32%     
+ Complexity    12715    12706       -9     
============================================
  Files          1035     1060      +25     
  Lines         60440    64335    +3895     
  Branches       7105     7105              
============================================
+ Hits          46002    48761    +2759     
- Misses        11989    12926     +937     
- Partials       2449     2648     +199     

see 32 files with indirect coverage changes

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[itsjfx]

Hi @spmallette sorry to bother you directly. Could you review my PR please :)

[vkagamlyk]

Hi @itsjfx,

Thanks for your contribution, in general I understand why this is needed.
a couple of small questions:

• in which version do you need this change? in 3.5, 3.6 or 3.7?
• it would be nice to add a line with a description to the changelog

[itsjfx]

hi @vkagamlyk ,
I'm happy with my changes to be rolled into 3.7. Have updated the changelog to reflect this as you requested.

[vkagamlyk]

thank you @itsjfx,

VOTE+1

to merge this PR need 3 votes or lazy consensus (simply wait a week)