Change the tests to run on Windows (#2615)

Most of the "expected" strings in terminal.go test were changed to
"text/template" values. Quotes in those string were parametrized in
the templates. Two functions handling templates were added
for convenience.

Templates has the advantage of:
- parametrize repetitive strings inside "expected" values
  - inner and outer quotes were parametrized in templates
  - long and confusing test values are more readable
- templates can be localized for other operating systems

src/reader_test.go

@@ -22,7 +22,7 @@ func TestReadFromCommand(t *testing.T) {
 	}
 
 	// Normal command
-	reader.fin(reader.readFromCommand(nil, `echo abc && echo def`))
+	reader.fin(reader.readFromCommand(nil, `echo abc&&echo def`))
 	if len(strs) != 2 || strs[0] != "abc" || strs[1] != "def" {
 		t.Errorf("%s", strs)
 	}