Added Host and amazon trace id

[romanchyla]

No description provided.

[coveralls]

Coverage decreased (-0.3%) to 95.933% when pulling dceffbc on romanchyla:tracing into ca87842 on adsabs:master.

[taylorshaulis]

I had to revert this PR. Solr-service was no longer generating valid HTTP requests (status 400)

I am going to run locally to try to tcpdump to figure out why nginx and nodejs no longer consider these requests valid

[taylorshaulis]

Ok this should be the same as PR 26 except for the def _get_host(self, url): function in solr/view.py has been modified so that it only returns the hostname and not http://hostname

I have tested this in Dev and both host and x-amzn-trace-id work now

2018-03-19 17:21:05.580 INFO (qtp97730845-15) [ x:collection1] o.a.s.c.S.Request [collection1] webapp=/solr path=/select params={q=references(bibcode:2012A%26A...544A..53G)&x-amzn-trace-id=Root%3D1-5aaff180-44e85d08b6342f489b5c4e8a&fl=title,bibcode,author,keyword,pub,aff,volume,year,links_data,[citations],property,pubdate,abstract&start=0&sort=first_author+asc&rows=25&wt=json} hits=21 status=0 QTime=168