Update to the newest flannel (v0.15.1)

[manuelbuil]

Fixes issues such as the internode connectivity

Signed-off-by: Manuel Buil [email protected]

Proposed Changes

Update flannel to fix a known bug in Ubuntu 21.04

Types of Changes

Update flannel to a new version

Verification

Linked Issues

#4188

User-Facing Change

Update flannel to 0.15.1

Further Comments

[manuelbuil]

Tested inter and intra node communications in ipv4 and ipv6 on Ubuntu 21.04

[codecov-commenter]

Codecov Report

Merging #4258 (6e410fa) into master (b5b7033) will increase coverage by 0.34%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4258      +/-   ##
==========================================
+ Coverage   11.19%   11.54%   +0.34%     
==========================================
  Files         135      135              
  Lines        9277     9277              
==========================================
+ Hits         1039     1071      +32     
+ Misses       8020     7978      -42     
- Partials      218      228      +10     

Flag	Coverage Δ
inttests	0.66% <ø> (?)
unittests	11.19% <ø> (ø)

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Impacted Files	Coverage Δ
pkg/flock/flock_unix.go	20.00% <0.00%> (+20.00%)	⬆️
tests/util/cmd.go	42.02% <0.00%> (+42.02%)	⬆️

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