Upgrade gtest to 1.10

[paul-szczepanek-arm]

Summary of changes

We want to use the new and easier to use MOCK_METHOD. The upgrade is backwards compatible.

The fixes applied are to add a missing namespace.

Impact of changes

Migration actions required

Documentation

none

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Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[] No Tests required for this change (E.g docs only update)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

@pan-

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[pan-]

Thanks Paul.
One of the major change is that gtest/gmock doesn't keep the pre C++11 support. This change should improved compilation time because it requires less template instantiation.

[pan-]

@0xc0170 We know it is a feature branch but we would like unit test run on this one. It doesn't seems to be covered by the travis check somehow.

Pull request has been modified.

[mbed-ci]

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