feat(serve): allow setting ssl certificate in angular-cli.json

[itslenny]

Currently users must use the --ssl, -ssl-cert, -ssl-key flags to run the
server using an ssl certificate. This update allows users to set
those options in default.serve so they can just run ng serve without any
flags.

[filipesilva]

Heya, this is a nice solid PR.

It seems to need a rebase though, and it's failing on appveyor:

Running "tests\misc\ssl-default-config" (89 of 100)...
Last step took 0.02s...
Error: ENOENT: no such file or directory, open 'C:\Users\appveyor\AppData\Local\Temp\1\angular-cli-e2e-117116-1040-1qtheza.r92jnpzaor\test-project\angular-cli.json'
Test "tests\misc\ssl-default-config" failed...
ENOENT: no such file or directory, open 'C:\Users\appveyor\AppData\Local\Temp\1\angular-cli-e2e-117116-1040-1qtheza.r92jnpzaor\test-project\angular-cli.json'
Error: ENOENT: no such file or directory, open 'C:\Users\appveyor\AppData\Local\Temp\1\angular-cli-e2e-117116-1040-1qtheza.r92jnpzaor\test-project\angular-cli.json'

The error seems to be due to the config filename, probably because it needs a dot now (.angular-cli.json). Not sure why travis didn't fail on that though.

[filipesilva]

I should mention that there is some time pressure to get this in due to RC0. I'm not sure we can add it afterwards since it does change the config api.

[filipesilva]

@itslenny I added my approval but it's contingent on CI passing, per usual.

[itslenny]

@filipesilva I got a failure on Travis that doesn't seem to be related to my change. Is this a known flaky test? It only failed in one of the environments.

�[37m  �[34mRunning `ng "e2e" "--watch" "--live-reload"` [silent, matching(/Spec started/)]...�[37m�[39m
�[37m  �[34mCWD: /tmp/angular-cli-e2e-117122-3895-lldysh.vkfp5sif6r/test-project�[37m�[39m
�[37mtravis_fold:end:tests.misc.live-reload�[39m
�[37m�[32mLast step took �[37m�[1m�[34m24.38�[37m�[22m�[32ms...�[37m�[39m

�[31mError: Expected API to have been called 2 times but it was called 1 times.�[39m
�[37m
�[39m
�[31m�[31mTest "tests/misc/live-reload" failed...�[31m�[39m
�[31m�[31mExpected API to have been called 2 times but it was called 1 times.�[31m�[39m
�[31m�[31mError: Expected API to have been called 2 times but it was called 1 times.
    at Promise.resolve.then.then.then.then.then.then.then._ (/home/travis/build/angular/angular-cli/tests/e2e/tests/misc/live-reload.ts:62:19)�[31m�[39m

[filipesilva]

Yes that test is flaky sometimes. I have ran into it today as well. I'll restart that job.

[filipesilva]

@itslenny thanks for your work getting this in!

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