Sanity test to verify files can be fetched from the network using git, http
and https fetchers point users at a page to help get set up in the case of a
failure.
Requires a variable CONNECTIVITY_CHECK_URIS to be set, using the same pattern
as SRC_URI, of URI's to test against.
The variable CONNECTIVITY_CHECK_MSG can be set to provide a custom error
message, such as a pointer to some help, when this check fails.
Addresses [YOCTO #933]
Signed-off-by: Joshua Lock <josh@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
