Allow to split https URI in the request line

it contribute panic dumping methods

Just warn unless --strict is used.  This allows to use the same .vcc in
4.0 and 4.1.

session number.

When building multiple vmods from the same source directory,
vmodtool would trample on other concurrent jobs' vcc_if.[ch].

Pointed out by phk@.

Using os.path.join() instead of string concatination is easier
to read.

I've verified the rest and only these 2 were affected.

Always use an oc+TRANSIENT for buffering, just don't commit the
storage if not caching.

tour through vcl_recv{}

Fixes: #1857

Pack oc 8 bytes tighter.

mechanisms into a single general ObjSubscribeEvents() mechanism.

For efficiency, only the events subscribed to will be delivered.

call into the stevedores methods.