[LayerNode] Change context to be RAII

[LayerNode] Change context to be RAII

This patch refactors context to be RAII to make layer node properties
dumb.

**Changes**
- init context is removed
   - layer node instead created and returned from layerNode::finalize(input_dims)
   - remove dependency to input dimension before initialize
   - layerNode now has input_shapes instead of setting directly from initContext
   - runcontext is used to query things
   - fix multiple bugs regarding the validity of layer node

- networkGraph::updateRunContext() -> finalizeContext() now
finalizes inside this function for brevity
- layerNode::updateRunContext() -> configureContext() to make it RAIIer.
- minor code cleans in networkGraph::initialize

**Self evaluation:**
1. Build test: [X]Passed [ ]Failed [ ]Skipped
2. Run test: [X]Passed [ ]Failed [ ]Skipped

Signed-off-by: Jihoon Lee <jhoon.it.lee@samsung.com>