Fix provisioner to install Git 2 from IUS

Fix provisioner to install Git 2 from IUS

While patch Ibace4cdf89d0615a2e5117f9ea3ca50730d5c93d fixed the setup
for the IUS repo. It failed to ensure that Git 2 is installed from the
IUS repo.

In the refactored IUS repo git2u no longer exists and instead the
latest Git package appears to be git224 so let's update to that
version.

Also class cast ansible_distribution_major_version|int as this variable
normally returns a type AnsibleUnsafeText which cannot be compared to
an int type.

Change-Id: I1cd815fb0440be996ba66c3a48eab9d6da02f4bb
Signed-off-by: Thanh Ha <zxiiro@gmail.com>