Dynamically get kitware asc key

[YangKeao]

Signed-off-by: Yang Keao [email protected]

What problem does this PR solve?

Fix #392

Another change is to use official ubuntu mirror default (rather than aliyun mirror). The source address can be controled by environment variable UBUNTU_MIRROR.

Check List

Tests

• Manual test

[zhouqiang-cl]

LGTM

[zhouqiang-cl]

/test

[codecov-io]

Codecov Report

Merging #395 into master will decrease coverage by 1.82%.
The diff coverage is 50.26%.

@@            Coverage Diff             @@
##           master     #395      +/-   ##
==========================================
- Coverage   60.40%   58.57%   -1.83%     
==========================================
  Files          36       60      +24     
  Lines        1985     3626    +1641     
==========================================
+ Hits         1199     2124     +925     
- Misses        692     1333     +641     
- Partials       94      169      +75     

Impacted Files	Coverage Δ
api/v1alpha1/iochaos_types.go	32.55% <ø> (ø)
api/v1alpha1/podchaos_types.go	32.55% <ø> (ø)
api/v1alpha1/timechaos_types.go	4.34% <0.00%> (-0.31%)	⬇️
controllers/kernelchaos_controller.go	0.00% <0.00%> (ø)
pkg/chaosdaemon/netlink_linux.go	0.00% <0.00%> (ø)
pkg/chaosdaemon/server.go	44.44% <0.00%> (ø)
pkg/ptrace/ptrace_linux.go	65.92% <ø> (ø)
pkg/utils/coalescer.go	0.00% <0.00%> (ø)
pkg/utils/graph.go	0.00% <0.00%> (ø)
pkg/utils/grpc.go	0.00% <0.00%> (ø)
... and 56 more

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[ethercflow]

LGTM