Add redis 6.0.* checksums. (DavidWittman#240)

Use redis_service_name for defaults file (DavidWittman#221)

Version 1.2.6

 - Add checksums for Redis versions up to 5.0.5
 - Add variable for hz
 - Don't fail in check mode
 - Add variable for lua-time-limit
 - Remove apt/zypper/yum/pkg loops to stop deprecation notice

Version 1.2.5

 - Use to_nice_json to prevent idempotency failures
 - Last version for Ansible 1.x

Version 1.2.4

 - Add redis group before user (DavidWittman#165)
 - Create alternatives for redis binaries (DavidWittman#119)

Version 1.2.3

 - Add checksums for Redis 3.2.{7,8} (DavidWittman#149)
 - Add notify_keyspace_events config (DavidWittman#152/DavidWittman#157)
 - Fix conditional evaluation with redis_tarball var (DavidWittman#158)

Version 1.2.2

 - Add separate task for systemd daemon reload (DavidWittman#143)
 - Recommend Ansible 2.1+ due to recent vulnerability (3549d83)
 - Only create/modify `redis_user` if it does not exist (DavidWittman#144)

Version 1.2.1

 - Add support for building 32-bit binaries with `redis_make_32bit` (DavidWittman#108)
 - Fix issues with piddir creation on systemd (DavidWittman#132)
 - Add checksums for new Redis versions

Version 1.2.0

 - Adds systemd support (DavidWittman#124)

Version 1.1.2

  - Add a few options to redis.conf
    - stop-writes-on-bgsave-error (default: yes)
    - rdbcompression (default: yes)
    - rdbchecksum (default: yes)
  - Use 0640 permissions instead of the default on redis.conf
    and sentinel.conf. Otherwise, any system user could potentially
    view the contents of the configuration.