travis-ci: fix tarantool repository enabling #58
Merged
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First, download.tarantool.org may use redirects, so curl -L (--location)
should be used. At least now it redirects from http to https when we ask
for a gpg key. In future it may redirect to another backend.
Next, added -s (--silent, don't show a progress meter), -S
(--show-error, show an error message on stderr), -f (--fail, no output
to stdout at error) for curl, because curl command is part of a shell
pipeline and this way the next pipeline command will not receive an
unexpected data like 404 Not found HTML page.
While I'm here, I changed all URLs to https, because those http URLs
anyway redirect to https.