This update setup ipsec-auth package so its version will automatically
increase with every commit.
Test Plan:
PASS: Make a change to any file in ipsec-auth package, rebuild the
package with "build-pkgs -c -p ipsec-auth", verify that the debian
package version increases by one, as following example:
Before change: ipsec-auth_1.0-1.stx.11_amd64.deb
After change: ipsec-auth_1.0-1.stx.12_amd64.deb
Related-Bug: 2109198
Change-Id: I414bed619fd93271d3a25abb1707f02f31c29171
Signed-off-by: Andy Ning <andy.ning@windriver.com>