Longhorn v1.0.2-rc2 release

Upgrade from/to RC is not supported.

Longhorn v1.0.2 is a stable release.

Enhancement

1. Now Longhorn ships with a default Pod Security Policy.
2. Enhanced Air Gap installation experience using Chart.

Bug Fixes

1. Fix an issue that might cause Longhorn installation stuck due to upgrade failure.
2. Speed up the Longhorn installation process.
3. Fix an issue that might cause Longhorn installation stuck due to Incompatible Engine image.
4. Fix an issue with containerd.

Upgrade:

Live upgrade from v1.0.2 from v1.0.0 or v1.0.1 is supported.