cgo compile error

Seeing error:

invalid flag in #cgo LDFLAGS:  ...

Could be related to: golang/go#23749

Need to investigate different compiler options to use to make it work on Go 1.10

Workaround

• Use a version of Go that doesn't have this problem

TODO

Need to document this in the YDK-Go README/docs

[111pontes]

Go 1.10 is the default version in many systems. This issue should be address soon as ydk-go would be broken out of the box for many users.

Need to ensure the default Go version for platform (ubuntu/centos) is supported. If default version for platform is not supported, this should be documented along with the reason why. Need to check go version.

[ygorelik]

The code specifies additional CGO flags to enable coverage tests. In order to ignore the flags the following environment variable should be set before compiling the Go code:

export CGO_ENABLED=1
export CGO_LDFLAGS_ALLOW="-fprofile-arcs|-ftest-coverage|--coverage"

Added above setting to Travis tests.