Remove definition of default host profile for Windows and Linux. Let user...

Remove definition of default host profile for Windows and Linux. Let user define default profile in profiles folder to have one common default profile for both contexts : build and host.

global.conf

-# Define default profile based on OS
-core:default_profile={{ 'win7-msvc12-x86-static' if platform.system() == 'Windows' else 'el6-gcc44-x86-shared' }}
 # Force use yum to install system on CentOS 6, with sudo and force install
 tools.system.package_manager:tool=yum
 tools.system.package_manager:sudo=True