remove unused boost includes

and deal with missing include fallout

tests/parser/integration/IncludeTest.cpp

@@ -23,6 +23,7 @@
 #include <opm/common/utility/FileSystem.hpp>
 #include <ostream>
 #include <fstream>
+#include <iostream>
 
 #include <opm/parser/eclipse/Deck/Deck.hpp>
 

tests/parser/integration/parse_write.cpp

@@ -17,6 +17,7 @@
   along with OPM.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <iostream>
 #include <sstream>
 
 #include <opm/parser/eclipse/Parser/Parser.hpp>