kata_proxy: Regenerate the proxy URL when needed
kata_proxy: Regenerate the proxy URL when needed

The proxy URL is not stored so when doing a cold exec or start,
we need to regenerate it in order for the shim to know where to
connect to.

Reported-by: Sebastien Boeuf <90b401417360b1924ef3f520ddee932686110f85@intel.com>
Signed-off-by: Samuel Ortiz <0ba86cb3f08bbb861958e54bd3438887adb4263c@linux.intel.com>

containers/virtcontainers,containers/virtcontainers