Update boto/auth.py
Update boto/auth.py

When using a proxy server AWSAuthConnection.build_base_http_request will modify the http_request.path to include the host header.  It caches the original path in the auth_path field so that the signature can be later correctly generated. 

Both the HMACAuthV3HTTPHandler and HMACAuthV4HTTPHandler signature generation methods in auth.py look at the original path and not auth_path which means boto will generate an incorrect signature when using a proxy server.

This patch updates those signature generation methods to use auth_path instead of path.
nexusz99/boto,darjus-amzn/boto,j-carl/boto,janslow/boto,varunarya10/boto,bryx-inc/boto,weebygames/boto,s0enke/boto,shaunbrady/boto,felix-d/boto,alex/boto,jamesls/boto,dablak/boto,lra/boto,weka-io/boto,andresriancho/boto,ric03uec/boto,jameslegg/boto,pfhayes/boto,nikhilraog/boto,serviceagility/boto,ddzialak/boto,kouk/boto,rosmo/boto,andresriancho/boto,zachmullen/boto,drbild/boto,jamesls/boto,tpodowd/boto,ocadotechnology/boto,appneta/boto,rjschwei/boto,rjschwei/boto,abridgett/boto,lochiiconnectivity/boto,Pretio/boto,yangchaogit/boto,elainexmas/boto,kouk/boto,revmischa/boto,vijaylbais/boto,disruptek/boto,clouddocx/boto,garnaat/boto,alfredodeza/boto,Timus1712/boto,stevenbrichards/boto,TiVoMaker/boto,ramitsurana/boto,rayluo/boto,jotes/boto,FATruden/boto,shipci/boto,vishnugonela/boto,khagler/boto,dimdung/boto,zzzirk/boto,alex/boto,lochiiconnectivity/boto,jindongh/boto,dablak/boto,ekalosak/boto,SaranyaKarthikeyan/boto,ryansb/boto,tpodowd/boto,cyclecomputing/boto,disruptek/boto,Asana/boto,nishigori/boto,drbild/boto,appneta/boto,campenberger/boto,jameslegg/boto,bleib1dj/boto,acourtney2015/boto,podhmo/boto,awatts/boto,trademob/boto,israelbenatar/boto