Added support to run avocado tests inside guest

Added test to support avocado tests run inside guest

Single or multiple avocado tests can be run by single
invocation of this test.
Signed-off-by: NSatheesh Rajendran <sathnaga@linux.vnet.ibm.com>

generic/tests/avocado_guest.py

+from virttest import utils_test
+
+
+def run(test, params, env):
+    """
+    Run an avocado test inside a guest.
+
+    :param test: QEMU test object.
+    :param params: Dictionary with test parameters.
+    :param env: Dictionary with the test environment.
+    """
+    vm = env.get_vm(params["main_vm"])
+    vm.verify_alive()
+    timeout = int(params.get("test_timeout", 3600))
+    testlist = []
+    avocadoinstalltype = params.get("avocadoinstalltype", "pip")
+    avocadotestrepo = params.get("avocadotestrepo",
+                                 "https://github.com/avocado-framework-tests/avocado-misc-tests.git")
+    avocadotest = params.get("avocadotest", "cpu/ebizzy.py")
+    avocadomux = params.get("avocadomux", "")
+    avocadotestargs = params.get("avocadotestargs", "")
+    for index, item in enumerate(avocadotest.split(',')):
+        try:
+            mux = ''
+            mux = avocadomux.split(',')[index]
+        except IndexError:
+            pass
+        testlist.append((item, mux))
+    utils_test.run_avocado(vm, params, test, testlist, timeout=timeout,
+                           testrepo=avocadotestrepo,
+                           installtype=avocadoinstalltype, reinstall=False,
+                           add_args=avocadotestargs, ignore_result=False)

generic/tests/cfg/avocado_guest.cfg

+- avocado_guest: install setup image_copy unattended_install.cdrom
+    no JeOS
+    virt_test_type = qemu libvirt
+    only Linux
+    type = avocado_guest
+    test_timeout = 1800
+    variants:
+        - ebizzy:
+            avocadotest = "cpu/ebizzy.py"
+            avocadomux = ""
+        - ebizzy_stress:
+            avocadotest = "cpu/ebizzy.py,perf/stress.py"
+            avocadomux = ","