SSL contexts reuse across locations

[Pavel Pautov]

Hi,

Here is another iteration of patch, now it completely avoids creating SSL contexts without SSL proxying.
Also changed some variable names and formatting in attempt to improve readability.
Not sure about moving of merge/reuse logic into ngx_http_proxy_set_ssl(). I assume, it could look like "ngx_http_proxy_set_ssl(cf, conf, prev, reuse_ssl)", which seems to widen its scope too much.

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