release: Kata Containers 1.6.0-rc2

- tracing: Hide trace messages unless tracing enabled
- tracing: Add OpenTracing support
- agent: increase the number of tries to online vcpus
- mount: add virtio-fs mount driver
- sysctl: Add complete sysctl support

6bd0f7c tracing: Hide trace messages unless tracing enabled
00cf907 tracing: Add OpenTracing support
cbd0aae docs: Explain developer mode
0b7cae1 docs: Add debug options to README
5cc1df7 docs: Update README
4383dbf git: Don't ignore "agent"
ab3e2c7 api: Remove unused variables
30d98fe build: Indent ifeq test
46ec60a build: Remove tabs
272f273 service: Don't shutdown the VM when agent terminates
bbe06a4 agent: Properly stop the gRPC server
30bebf5 agent: increase the number of tries to online vcpus
d5e64f6 tests: Add test for cheking sysctls
1f9ac24 cpu: re-arrange code to reduce cyclomatic complexity
4f249bf sysctl: Add complete sysctl support
42e664f mount: add virtio-fs mount driver

Signed-off-by: Peng Tao <[email protected]>

VERSION

@@ -1 +1 @@
-1.6.0-rc1
+1.6.0-rc2