branching: merge stable into default

branching: merge default into stable This marks the feature freeze for the 6.3 release

lfs: fix interpolation of int and %s in an exception case Seen in the wild in a server log when MS antivirus was quarantining a file on the client side.

tests: catch "Can't assign requested address" in test-https.t (issue6726)

tests: add another variation of EADDRNOTAVAIL message (e.g. from NetBSD)

shelve: re-wrap now that the line fits

shelve: avoid setting overloading tmpwctx

configitems: change the `verify.skipflags` default value to avoid a py3 crash The revlog and LFS modules use various `&` and `&=` operations with this value, which no longer treats `None` as 0. Since nothing cares if it was actually set in the config or not, just default to 0 for simplicity.