HYD-6391 Bump npm version in makefile
HYD-6391 Bump npm version in makefile

Bump the npm version used while building to 3.10.6. Also extract the
repeated version number to a variable.

  - Bump version to 3.10.6.
  - Extract to variable.

Change-Id: I1413646f7669b1bd191c35ccf9ab9e8d4a03db80
Signed-off-by: Joe Grund <5a0004131f5af71cc30270f318d2c30ba7aaa99a@intel.com>
Reviewed-on: http://review.whamcloud.com/22229
Tested-by: Jenkins
Tested-by: Chroma Test User
Reviewed-by: Will Johnson <12b9e8082b7fae5ba694976591ab55465e35debd@intel.com>
Reviewed-by: Kelsey Prantis <891d505c4b8f252568785ec2b0d34b82fde8f616@intel.com>
Reviewed-by: Brian J. Murrell <2a8f564cbb80211e19c0a14fed38a451599c042f@intel.com>

intel-hpdd/intel-manager-for-lustre,intel-hpdd/intel-manager-for-lustre,intel-hpdd/intel-manager-for-lustre