Fix "netconf_is_ready" not always reflecting netconf status

Fix "netconf_is_ready" not always  reflecting netconf status

If the "Check_Whether_Netconf_Is_Up_And_Running" test case
fails or is skipped, the "netconf_is_ready" is left set to
False even when "Wait_For_Netconf" concludes that Netconf IS
ready. This will break further test cases if they rely on
"netconf_is_ready" to determine whether the Netconf was seen
to be up and running or not. The fix simply tells the
"Wait_For_Netconf" test case to update the variable.

Change-Id: I05e18cd491dc414b036cb68504dcf3b39e0c2490
Signed-off-by: Jozef Behran <jbehran@cisco.com>