Fixed bug in env.bash
Fixed bug in env.bash

sh uses '.' to source a file. For some reason 'source' is allowed, but
not on all systems and therefore is not portable.

Change-Id: I21efb436772cfaa9d9df61e859b88685b57ddcd3
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/42235
Tested-by: Jenkins Server <8e3f934e4c44875bc48d33da3ea13d93ba9a233f@us.ibm.com>
Tested-by: Jenkins OP Build CI <e610bd72261d3c0a48f1e8ae36832ab00774d426@us.ibm.com>
Tested-by: FSP CI Jenkins <aa9e4d9ac7cd25905e9c0dd36d4150516e73dd86@us.ibm.com>
Reviewed-by: Caleb N. Palmer <4dd1938fbd016e66315ec83516544b027a7e47e1@us.ibm.com>
Reviewed-by: Daniel M. Crowell <912029ca9254ac7b5854e56910561d682e1fa2d0@us.ibm.com>
Reviewed-by: Benjamin J. Weisenbeck <5c9571551d3c5d31d5a99a7e8d72fcb5684103ff@us.ibm.com>
Reviewed-by: Zane C. Shelley <fc96e127d170d6ac0b2af86a8a56f95974ff36e8@us.ibm.com>

Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,Over-enthusiastic/hostboot