tests: Expand abbreviations for readability

Continuation of commit d793351
Expand abbreviations to improve readability:

PSO -> pipeline state object
w/o -> without

Change-Id: Ia0281b4d2dc00541a70bc48710daa0ffd89d9117
diff --git a/tests/layer_validation_tests.cpp b/tests/layer_validation_tests.cpp
index 67af815..67e7b63 100644
--- a/tests/layer_validation_tests.cpp
+++ b/tests/layer_validation_tests.cpp
@@ -6616,7 +6616,7 @@
 
     ASSERT_NO_FATAL_FAILURE(InitState());
     // Dynamic viewport state
-    m_errorMonitor->SetDesiredFailureMsg(VK_DEBUG_REPORT_ERROR_BIT_EXT, "Dynamic viewport(s) 0 are used by PSO, but were not provided");
+    m_errorMonitor->SetDesiredFailureMsg(VK_DEBUG_REPORT_ERROR_BIT_EXT, "Dynamic viewport(s) 0 are used by pipeline state object, but were not provided");
     VKTriangleTest(bindStateVertShaderText, bindStateFragShaderText, BsoFailViewport);
     m_errorMonitor->VerifyFound();
 }
@@ -6627,7 +6627,7 @@
 
     ASSERT_NO_FATAL_FAILURE(InitState());
     // Dynamic scissor state
-    m_errorMonitor->SetDesiredFailureMsg(VK_DEBUG_REPORT_ERROR_BIT_EXT, "Dynamic scissor(s) 0 are used by PSO, but were not provided");
+    m_errorMonitor->SetDesiredFailureMsg(VK_DEBUG_REPORT_ERROR_BIT_EXT, "Dynamic scissor(s) 0 are used by pipeline state object, but were not provided");
     VKTriangleTest(bindStateVertShaderText, bindStateFragShaderText, BsoFailScissor);
     m_errorMonitor->VerifyFound();
 }
@@ -10431,7 +10431,7 @@
     // Now hit second fail case where we set scissor w/ different count than PSO
     // First need to successfully create the PSO from above by setting
     // pViewports
-    m_errorMonitor->SetDesiredFailureMsg(VK_DEBUG_REPORT_ERROR_BIT_EXT, "Dynamic scissor(s) 0 are used by PSO, ");
+    m_errorMonitor->SetDesiredFailureMsg(VK_DEBUG_REPORT_ERROR_BIT_EXT, "Dynamic scissor(s) 0 are used by pipeline state object, ");
 
     VkViewport vp = {}; // Just need dummy vp to point to
     vp_state_ci.pViewports = &vp;
@@ -10594,7 +10594,7 @@
     // Now hit second fail case where we set scissor w/ different count than PSO
     // First need to successfully create the PSO from above by setting
     // pViewports
-    m_errorMonitor->SetDesiredFailureMsg(VK_DEBUG_REPORT_ERROR_BIT_EXT, "Dynamic viewport(s) 0 are used by PSO, ");
+    m_errorMonitor->SetDesiredFailureMsg(VK_DEBUG_REPORT_ERROR_BIT_EXT, "Dynamic viewport(s) 0 are used by pipeline state object, ");
 
     VkRect2D sc = {}; // Just need dummy vp to point to
     vp_state_ci.pScissors = ≻
@@ -13618,7 +13618,7 @@
     ASSERT_NO_FATAL_FAILURE(InitState());
     ASSERT_NO_FATAL_FAILURE(InitRenderTarget());
 
-    const char *simultaneous_use_message1 = "w/o VK_COMMAND_BUFFER_USAGE_SIMULTANEOUS_USE_BIT set!";
+    const char *simultaneous_use_message1 = "without VK_COMMAND_BUFFER_USAGE_SIMULTANEOUS_USE_BIT set!";
     const char *simultaneous_use_message2 = "does not have VK_COMMAND_BUFFER_USAGE_SIMULTANEOUS_USE_BIT set and "
                                             "will cause primary command buffer";