Handle crashes due to bad requests

[rahulreddy]

{"name":"Utapi","time":1483200135653,"error":"URI malformed","stack":["URIError: URI malformed","at decodeURIComponent (native)","at /home/scality/S3/node_modules/utapi/dist/lib/UtapiRequest.js:86:27","at Array.forEach (native)","at UtapiRequest.setRequestQuery (/home/scality/S3/node_modules/utapi/dist/lib/UtapiRequest.js:84:28)","at UtapiServer.requestListener (/home/scality/S3/node_modules/utapi/dist/lib/server.js:84:160)","at Server.<anonymous> (/home/scality/S3/node_modules/utapi/dist/lib/server.js:125:74)","at emitTwo (events.js:87:13)","at Server.emit (events.js:172:7)","at HTTPParser.parserOnIncoming [as onIncoming] (_http_server.js:533:12)","at HTTPParser.parserOnHeadersComplete (_http_common.js:103:23)"],"level":"fatal","message":"caught error","hostname":"redacted","pid":709}