support reloctable venv roots in testing framework

run_tests.sh, with_venv.sh, and the install_venv.py scripts now
support relocating the venv root to another location.

All 3 scripts now support new envinroment variables to configure
the location of the venv and the tools directory. To maintain
compatability the defaults are set to the current values.

venv_path = Location of the virtualenv directory
	Default: $(pwd)

venv_name = Name of the virtualenv directory
	Default: .venv

tools_path = Location of the tools directory
	Default: $(pwd)

Additionally the run_tests.sh script also takes these value as
arguments and will pass them along accordingly.

--virtual-env-path <path>   Location of the virtualenv directory
                             Default: $(pwd)
--virtual-env-name <name>   Name of the virtualenv directory
                             Default: .venv
--tools-path <dir>          Location of the tools directory
                             Default: $(pwd)

DocImpact

Change-Id: I1be036058227206ecca342f692cd3d6aadb24069
Fixes: bug #1116942

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