*     Issue#192 Support multiple edge types in GO statement

Summary:
Implemented over multiple edge types(include over "*" ) for Support all edge type in Go statement.

1. Modification of the storage interface:
   1.1 Modify the GetNeighborsRequest structure, pass a list of edge_type to the storage layer.
   1.2 And add an over_all_edges tag to mark "over *".
       Modify the PropDef structure to represent both tag_id and edge_type
   1.3 Added the EdgeData structure to represent the edge data returned to the client.
2. When the yield statement does not exist, rename the "_dst" attribute of edge to edge_name+"_id"
3. Delete the getOutBound and getInBound interfaces,
   because the edges passed to the storage may have both in and out.
4  Added a map of edge type to edge name for metaclien (toEdgeName)

PS:
There are still two issues that need to be implemented.
1 Since we are not implementing a null type, we cannot represent some non-existing attributes.
2 Due to the existence of 1, there is currently no judgment on the attributes of the edges and the vetex.
So when returning multiple types of vetex/edge,
the same result will be returned if the attribute names are the same("MULTI_EDGES" test in GoTest.cpp).

* 1. add more test.
2. Solved the problem of display when some properties are not present(return the default value to the user).

for example:
type             default
int              0
bool             false
double/float     0.0

* format the code style.

* 1. When yield does not exist, don't implicitly rename _dst prop.
2. format some code style.

* Fixed an problem where the results might be incorrect when using multiple edges with filter.

* Modify the storage interface to move the schema from tagdata/edgedata to QueryResponse.

* Address dangleptr's and wadeliuyi's comments.

*  Address dangleptr's and laura's comments.

* Address laura's comments.

*      Address dangleptr's comments.

* Address dangleptr's comments.

* Address dangleptr's comments.

* fixed the unit test failed(go_test and orderbytest).