Show problems from other files for gobuild and gometalinter

* Added filename keys to gobuild and gometalinter
* Removed skipping files not in current package
* Removed `--include` for gometalinter
* Fixed the tests

ale_linters/go/gobuild.vim

@@ -1,4 +1,5 @@
-" Author: Joshua Rubin <joshua@rubixconsulting.com>, Ben Reedy <https://github.com/breed808>
+" Author: Joshua Rubin <joshua@rubixconsulting.com>, Ben Reedy <https://github.com/breed808>,
+" Jeff Willette <jrwillette88@gmail.com>
 " Description: go build for Go files
 
 " inspired by work from dzhou121 <dzhou121@gmail.com>
@@ -39,15 +40,12 @@ function! ale_linters#go#gobuild#GetMatches(lines) abort
 endfunction
 
 function! ale_linters#go#gobuild#Handler(buffer, lines) abort
+    let l:dir = expand('#' . a:buffer . ':p:h')
     let l:output = []
 
     for l:match in ale_linters#go#gobuild#GetMatches(a:lines)
-        " Omit errors from imported go packages
-        if !ale#path#IsBufferPath(a:buffer, l:match[1])
-            continue
-        endif
-
         call add(l:output, {
+        \   'filename': ale#path#GetAbsPath(l:dir, l:match[1]),
         \   'lnum': l:match[2] + 0,
         \   'col': l:match[3] + 0,
         \   'text': l:match[4],