io: refactoring EmbedGenerateCookie to reduce stack usage:
--- use ShaHash instead of InitSha, ShaUpdate and ShaFinal (sizeof(Sha) saved)

io: refactoring EmbedOcspLookup to reduce stack usage:
--- variable domainName moved to the heap (80 bytes saved)
--- variable path moved to the heap (80 bytes saved)
io: refactoring EmbedOcspLookup:
--- single return point
--- changed stack reduction MEMORY_E to -1 to match XMALLOC fail at httpBuf
--- variable written removed
--- variable ocspRespSz renamed to ret (initialized with -1  and set only once with process_http_response result)