arm/oeqa: Merge all OEFVP*Target classes

The differences between OEFVPTarget, OEFVPSSHTarget and
OEFVPSerialTarget are not obvious and there is a lot of duplication.

Merge all the logic into one OEFVPTarget (again). This has the following
features:
 * Run SSH commands
 * Run serial console assertions
 * Lazily await a Linux login prompt while running test cases (only when
   self.target.run is called).

Signed-off-by: Peter Hoyes <Peter.Hoyes@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm-bsp/conf/machine/corstone1000-fvp.conf

@@ -8,7 +8,7 @@ TFA_TARGET_PLATFORM = "fvp"
 TFM_PLATFORM_IS_FVP = "TRUE"
 
 # testimage config
-TEST_TARGET = "OEFVPSerialTarget"
+TEST_TARGET = "OEFVPTarget"
 TEST_SUITES = "linuxboot"
 
 # FVP Config

meta-arm-bsp/conf/machine/corstone500.conf

@@ -32,7 +32,7 @@ WKS_FILE_DEPENDS:append = " ${EXTRA_IMAGEDEPENDS}"
 
 WKS_FILE ?= "core-image-minimal.corstone500.wks"
 
-TEST_TARGET = "OEFVPSerialTarget"
+TEST_TARGET = "OEFVPTarget"
 TEST_SUITES = "linuxboot"
 
 FVP_PROVIDER ?= "fvp-corstone500-native"

meta-arm-bsp/conf/machine/fvp-baser-aemv8r64.conf

@@ -29,7 +29,7 @@ MACHINE_FEATURES:append = " efi"
 MACHINE_EXTRA_RRECOMMENDS += "ssh-pregen-hostkeys"
 
 # testimage configuration
-TEST_TARGET = "OEFVPSerialTarget"
+TEST_TARGET = "OEFVPTarget"
 TEST_SUITES = "linuxboot"
 TEST_TARGET_IP ?= "127.0.0.1:8022"
 TEST_SERVER_IP ?= "127.0.1.1"

meta-arm-bsp/conf/machine/tc1.conf

@@ -6,7 +6,7 @@
 
 require conf/machine/include/tc.inc
 
-TEST_TARGET = "OEFVPSerialTarget"
+TEST_TARGET = "OEFVPTarget"
 TEST_SUITES = "linuxboot"
 
 # FVP Config