Enablement TravisCI integration for IBM ppc64le architecture

[harinreddy]

Enablement TravisCI integration for IBM ppc64le architecture

[harinreddy]

Currently, https://github.com/jaegertracing/ jaeger-client-cpp is not enabled for TravisCI on IBM ppc64le architecture.

The following changes are proposed to enable TravisCI for jaeger-client-cpp of ppc64le.

One of the prerequisite packages for the jaeger-client-cpp the is the cmake package. The current travis.yml instructions specify installing a prebuilt package for x86 architecture only.
We propose to extend this to include ppc64le architecture as specified below:

• Create a script called “before-install.sh” under the existing “scripts” directory
• This script will include the following instructions
• If the architecture is ppc64le, download source for cmake 3.11.0 and build and install cmake packge
• Otherwise, current instructions in Travis.yml to download prebuilt package for x86 are moved into before-install.sh.
• Modify the current travis.yml to include instructions to use the before-install.sh to install the cmake package.

Currently, the proposed changes have been applied to a fork: https://github.com/harinreddy/jaeger-client-cpp and tested for TravisCI integration.

A Pull Request will be submitted to update the master at https://github.com/jaegertracing/ jaeger-client-cpp.

We appreciate your feedback on this request.