binding2-generator-fix : About package name

Pls take a look at the attachment, and notice directory 'A1' 'C' ,different with 'b1' 'e1'
yang model:
module foo1{
namespace "urn:test:foo1";
prefix foo1;

revision 2017-01-01;

grouping A {
container A1 {
container A1-inner {
leaf leaf-A1-inner

{ type string; }
container A1-inner-inner {
leaf leaf-A1-inner-inner{ type string; }
}
}
}
}

grouping B {
container B1 {
container B1-inner {
leaf leaf-B1-inner{ type string; }

container B1-inner-inner {
leaf leaf-B1-inner-inner

{ type string; }

}
}
}
}

grouping C {
container C1 {
container C1-inner {
leaf leaf-C1-inner

{ type string; }

container C1-inner-inner {
leaf leaf-C1-inner-inner

{ type string; }
}
}
}
}

grouping E {
container E1 {
container E1-inner {
leaf leaf-E1-inner{ type string; }

container E1-inner-inner {
leaf leaf-E1-inner-inner

{ type string; }

}
}
}
}

}