build: allow for rc3/rc4 style tags
build: allow for rc3/rc4 style tags

Historically, there was only rc1/rc2 tags, fix in case we tag
rc3/rc4 during longer release windows.

Type: fix
Change-Id: I4243a1c03663a877f96a06d647e89adb74abd977
Signed-off-by: Andrew Yourtchenko <eb6233fe2fbd585844f4fb8426b53b186ab379b1@gmail.com>

chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp