Platform version check during wgt installation

Platform version check during wgt installation

Additionaly m_quiet field of install context
is initialy set to "false". Setting this field
to true by default cause permanent disabling
of some installer features (additional checks,
popups).

[Issue#] N/A
[Feature] Platform version is checked and compared
to required_version from config.xml. If test mode
enabled (WRT_TEST_MODE=1) installation fails when
platform version lower than required. If test mode
disabled popup with question is shown.
[Cause] Compatibility check during installation
needed
[Solution] N/A

[Verification] Build installer. Try to install
widget manual_tests/Tizen_Spec/TC6 from wrt-extra
with test mode enabled and disabled.

Change-Id: Ib77ac402401fdd7673623d8e00bb92cdf89ed5c7