Removed use of pid_cycle file and ENVIRONMENT macros

Removed use of pid_cycle file and ENVIRONMENT macros

[Bug/Feature]   Security-server client tests failure with smack disabled
                while test environment preparations
[Cause]         pid_cycle file was created in a nonexistent directory.
                Moreover, this file seems to be unused in any way
                further and not deleted either.
[Solution]      Get rid of pid_cycle file usage. In addition,
                ENVIRONMENT and ENVIRONMENT_NOSMACK macros were deleted
                in favour of drop_root_privileges function for nonsmack
                tests and AccessProvider class for smack tests.
                There were also duplicated tests about security server
                cookies - they were moved to cookie_api.cpp.
                Tests run as app user in cookie_api.cpp are now distinguished
                from others with changed name having "_app_user_" string.
[Verification]  Build, install and run tests, i.e.:
                security-tests.sh ss-server --runignored --output=text
                security-tests.sh ss-clientsmack --runignored --output=text

Change-Id: I68ad3f0bb12f437fa927660327c5e44f91e91446
Signed-off-by: Sebastian Grabowski <s.grabowski@partner.samsung.com>