[build2] bpkg: curl fails without retry

[Feiyun Wang]

Hi,
Curl exited without retry when something wrong happened, when I was running ".\build-msvc.bat --trust yes --timeout 3600":````G:\download\dev\odb\build2-toolchain-0.8-a.0>bpkg-stage  build --fetch-timeout 3600 --for install --yes build2 bpkg bdeplibpkgconf-1.4.2-a.0.20180712090405.281f6add6f3f.tar.gz:######################################################################## 100.0%fetched libpkgconf/1.4.2-a.0.20180712090405.281f6add6f3funpacked libpkgconf/1.4.2-a.0.20180712090405.281f6add6f3fconfigured libpkgconf/1.4.2-a.0.20180712090405.281f6add6f3flibsqlite3-3.18.2+3.tar.gz:######################################################################## 100.0%fetched libsqlite3/3.18.2+3unpacked libsqlite3/3.18.2+3configured libsqlite3/3.18.2+3libodb-2.5.0-b.8.20180711192430.16068c26c830.tar.gz:######################################################################## 100.0%fetched libodb/2.5.0-b.8.20180711192430.16068c26c830unpacked libodb/2.5.0-b.8.20180711192430.16068c26c830configured libodb/2.5.0-b.8.20180711192430.16068c26c830libodb-sqlite-2.5.0-b.8.20180711192513.3c6a4cda9f4e.tar.gz:-=O=-                                              #     #    #    #curl: (35) OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to stage.build2.org:443error: unable to fetch https://stage.build2.org/1/odb/libodb-sqlite-2.5.0-b.8.20180711192513.3c6a4cda9f4e.tar.gz  info: re-run with -v for more information````
I suggest that bpkg-stage can retry for some times automatically when curl fails, like wget does.
Sincerely,Feiyun Wang
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