pgAdmin 4 commit: Moved the webcabin-docker in the'web/pgadmin/static/

Moved the webcabin-docker in the 'web/pgadmin/static/vendor' directory to resolve a possible issue, when we created
webpackreference for vendor. 

webcabin-docker uses the jquery.1.11.1 as hard dependency, and latest jquery for 1.11.2 is available as npm, and which
isused by us. Webpack reference will have two different set of jquery in it. Hence - vendorizing the webcabin-docker
willallow us to change the package.json of it, and will resolve the possible issue. 

Also - upgraded some packages in package.json to resolve the deprecation message during package installation using
yarn.
i.e.
babel-loader -> ^7.1
extract-text-webpack-plugin -> ^3.0
karma-phantomjs-launcher -> ^1.0.4
karma-webpack -> ^2.0.4
phantomjs-prebuilt -> ^2.1.15

Branch
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WEBPACK_DEVEL2

Details
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https://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=ee8487fcf256057a40e6886093cb2d242679c724

Modified Files
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web/yarn.lock | 1371 +++++++++++++++++++++++++++++++++++++++------------------
1 file changed, 949 insertions(+), 422 deletions(-)