Add ARM64 job in Travis-CI

[odidev]

Patch Details: Following files has been modified : travis.yml: Added arm64 architecture in travis.yml tools/verify-all.sh: Modified verify-all.sh file by updating the version of docker image for package openapi-generator-cli which is supported on arm64 platform

Signed-off-by: odidev [email protected]

[linux-foundation-easycla[bot]]

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