[Build][202106] Add the missing debian security mirrors in slave images (#11305) #11324
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Why I did it
The build below was broken, it was caused by one of the required debian mirror missing.
https://dev.azure.com/mssonic/build/_build/results?buildId=116719&view=logs&j=88ce9a53-729c-5fa9-7b6e-3d98f2488e3f&t=88f376cf-c35d-5783-0a48-9ad83a873284
libpci-dev : Depends: libudev-dev (>= 196) but it is not going to be installed
libsystemd-dev : Depends: libsystemd0 (= 232-25+deb9u14) but 232-25+deb9u13 is to be installed
How I did it
Add the missing mirrors for buster and stretch.
Why I did it
Cherry-pick #11304
The build below was broken, it was caused by one of the required debian mirror missing.
https://dev.azure.com/mssonic/build/_build/results?buildId=116719&view=logs&j=88ce9a53-729c-5fa9-7b6e-3d98f2488e3f&t=88f376cf-c35d-5783-0a48-9ad83a873284
How I did it
Add the missing mirrors for buster and stretch.
How to verify it
Which release branch to backport (provide reason below if selected)
Description for the changelog
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)