Verify the size of DynamicBox

Verify the size of DynamicBox

* How it works:
  - When wrt-installer installs DynamicBox webapp, parse the boxsize attribute in config.xml.
  - Verify the boxsize using web_provider_plugin_check_supported_size API provided from web-provier.
  - If unsupported size is found, installer sends a ThrowMsg
  - Web application install should fail.

[Issue#]   N/A
[Problem]  When there is unsupported boxsize specified in config.xml, webapp is still installed successfully.
[Cause]    The boxsize attribute of DynamicBox in config.xml is not checked at the install time.
[Solution] Verify the boxsize attribute of DynamicBox in config.xml

[SCMRequest] N/A

Change-Id: If18ea9136687bfacf8d516bcbbadf8042cbb3e12