Add pecl-redis 3.1.1 (copied from php56-redis and updated to 3.1.1)

• Remove databases/php56-redis, databases/php70-redis and databases/php71-redis
• Add MOVED entries
• While I'm here, add LICENSE_FILE

Changes: https://pecl.php.net/package-changelog.php?package=redis
PR: 216700
Submitted by: Daniel Ylitalo <daniel@blodan.se> (maintainer of databases/php71-redis)
Approved by: Mikhail Tsatsenko <m.tsatsenko@gmail.com> (maintainer of databases/php56-redis),

		Joshua Ruehlig <joshruehlig@gmail.com> (maintainer of databases/php70-redis, timeout, 14 days)