agent: Use straightforward names for the default socket names.
* configure.ac (GPG_AGENT_SOCK_NAME): Change name to *.extra. (GPG_AGENT_EXTRA_SOCK_NAME): Change name to *browser.
There has been quite some fuzz about the naming of the (new) default
socket files. The used names do not match the names of the option.
Because these are just names we now change the names to match the
names of the options instead of changing the option names to something
we can't agree upon.
- Signed-off-by: Werner Koch <wk@gnupg.org>