gtest: Hotfix to prevent download failure
gtest: Hotfix to prevent download failure

gtest-1.7.0.zip (md5=2d6ec8ccdf5c46b05ba54a9fd1d130d7) is gone from:
  https://googletest.googlecode.com/files/gtest-1.7.0.zip

So let's switch to a mirrored file:
  http://pkgs.fedoraproject.org/repo/pkgs/gtest/gtest-1.7.0.zip/2d6ec8ccdf5c46b05ba54a9fd1d130d7/gtest-1.7.0.zip

Note, now upstream project moved to:
  https://github.com/google/googletest/archive/release-1.7.0.zip

But archive structure is different (configure is missing),
 so a additional works are needed,
 maybe it worth to be done on latest release instead (1.8.0 ATM).

Change-Id: Ib1cf308fb2d3a15bdf69246cccfd379234bbce22
Bug: https://jira.iotivity.org/browse/IOT-820
Origin: https://gerrit.iotivity.org/gerrit/#/c/11119/
Signed-off-by: Philippe Coval <ff46fec9739d31cce915aabcc3a7a2c00eee4d6c@osg.samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/11119
Tested-by: jenkins-iotivity <09cb29e8a2b473a2c978382eec13ee06fa017bda@opendaylight.org>
Reviewed-by: Jaehong Jo <69db334b3f87f30654728856fde276b43c835fe5@samsung.com>
Reviewed-by: Jihun Ha <3b6954bd112a2585eced0b86af3c85401a826886@samsung.com>
Reviewed-by: Jaewook Jung <e30c770b7f9b30402e4d6c2240cd5b03cb3bf7f9@samsung.com>
Reviewed-by: Uze Choi <3a26c91d8a4a3c9e246e43339f4782bb2483aece@samsung.com>

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