HPCC-20458 Allow File Access keys to be defined in the environment

Add new CLI envmod for processing modification templates to modify
environment files.
Update modification template support.
Add unit tests for new features.

Signed-off-by: Ken Rowland <kenneth.rowland@lexisnexisrisk.com>

configuration/CMakeLists.txt

@@ -1,5 +1,5 @@
 ################################################################################
-#    HPCC SYSTEMS software Copyright (C) 2016 HPCC Systems.
+#    HPCC SYSTEMS software Copyright (C) 2018 HPCC Systems.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -15,3 +15,4 @@
 ################################################################################
 
 HPCC_ADD_SUBDIRECTORY (configmgr)
+HPCC_ADD_SUBDIRECTORY (cli)

configuration/cli/CMakeLists.txt

@@ -0,0 +1,17 @@
+################################################################################
+#    HPCC SYSTEMS software Copyright (C) 2018 HPCC Systems.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License");
+#    you may not use this file except in compliance with the License.
+#    You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS,
+#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#    See the License for the specific language governing permissions and
+#    limitations under the License.
+################################################################################
+
+HPCC_ADD_SUBDIRECTORY (envmod)

configuration/cli/envmod/CMakeLists.txt

@@ -0,0 +1,34 @@
+################################################################################
+#    HPCC SYSTEMS software Copyright (C) 2018 HPCC Systems.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License");
+#    you may not use this file except in compliance with the License.
+#    You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS,
+#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#    See the License for the specific language governing permissions and
+#    limitations under the License.
+################################################################################
+
+project ( envmod )
+
+SET (SRC_FILES
+        envmod.cpp
+)
+
+INCLUDE_DIRECTORIES(
+        ${CMAKE_BINARY_DIR}
+        ${HPCC_SOURCE_DIR}/system/include
+        ${HPCC_SOURCE_DIR}/configuration/configmgr/configmgrlib
+        ${HPCC_SOURCE_DIR}/configuration/configmgr/RapidJSON/include
+)
+
+HPCC_ADD_EXECUTABLE ( envmod ${SRC_FILES} )
+
+INSTALL ( TARGETS envmod RUNTIME DESTINATION ${EXEC_DIR} )
+
+TARGET_LINK_LIBRARIES(envmod configmgr)