$overtime has been used since swanctl.init was added in
f9d91f1f47.
However, there's no need for it to be global. Make it local like the
other config variables to avoid polluting the global namespace and make
the code easier to reason about.
Fixes: f9d91f1f470a ("strongswan: migrate to swanctl configs")
Signed-off-by: Kevin Locke <redacted>
local local_key
local ca_cert
local rekeytime
+ local overtime
local send_cert
local remote_ca_certs
local pools