provider/github: Log HTTP requests and responses in DEBUG mode

[radeksimko]

This should shed some light on the intermittent failures of Github acceptance tests that we keep seeing.

Example

2017/05/10 21:54:51 [DEBUG] Github API Request Details:
---[ REQUEST ]---------------------------------------
POST /repos/*REDACTED*/test-repo/labels HTTP/1.1
Host: api.github.com
User-Agent: go-github/4
Content-Length: 32
Accept: application/vnd.github.v3+json
Content-Type: application/json
Accept-Encoding: gzip

{"name":"foo","color":"000000"}

-----------------------------------------------------
2017/05/10 21:54:52 [DEBUG] Github API Response Details:
---[ RESPONSE ]--------------------------------------
HTTP/1.1 201 Created
Content-Length: 137
Access-Control-Allow-Origin: *
Access-Control-Expose-Headers: ETag, Link, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval
Cache-Control: private, max-age=60, s-maxage=60
Content-Security-Policy: default-src 'none'
Content-Type: application/json; charset=utf-8
Date: Wed, 10 May 2017 19:54:52 GMT
Etag: "33ce873352f0894f03139ca05792060c"
Location: https://api.github.com/repos/*REDACTED*/test-repo/labels/foo
Server: GitHub.com
Status: 201 Created
Strict-Transport-Security: max-age=31536000; includeSubdomains; preload
Vary: Accept, Authorization, Cookie, X-GitHub-OTP
Vary: Accept-Encoding
X-Accepted-Oauth-Scopes: 
X-Content-Type-Options: nosniff
X-Frame-Options: deny
X-Github-Media-Type: github.v3; format=json
X-Github-Request-Id: DFCB:3F97:7787E93:9426BC2:5913700C
X-Oauth-Scopes: public_repo
X-Ratelimit-Limit: 5000
X-Ratelimit-Remaining: 4998
X-Ratelimit-Reset: 1494449692
X-Served-By: 2d7a5e35115884240089368322196839
X-Xss-Protection: 1; mode=block

{"id":602417973,"url":"https://api.github.com/repos/*REDACTED*/test-repo/labels/foo","name":"foo","color":"000000","default":false}
-----------------------------------------------------

[paddycarver]

LGTM, but because it's not necessary for the release, let's wait until after the release to merge. Cool?

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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