R1:1b9da964e970

Add setup check to avoid git version 2.5.0 and below (May 2015)

Summary:
After this change, if you have a deprecated git version,
now you see a related information config warning:

{F276840}

Having said that the git version 1.8.3.1 - that for example
is provided by CentOS 7 - is surely problematic;

Some sources indicate all git versions *before* 2.5.0 as not
able to handle the '--' escape argument. The '--' arg
is used to separate normal git flags from user arguments,
so that they cannot be mistakenly…