Merge pull request #76 from sequenceiq/null-fix

CLOUD-235 credential panel show just not null values
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CLOUD-275 support for aws c type instances
Merge pull request #77 from sequenceiq/new-aws-instance-types

LGTM
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CLOUD-235 added usages and event
CLOUD-235 added event filters
CLOUD-235 removed table column
CLOUD-235 fixed filter
CLOUD-235 fixed blueprint filter
CLOUD-235 fixed central variables