codeparser: Track oe.utils.conditional usage

* base_conditional was already removed from oe-core:
  http://git.openembedded.org/openembedded-core/commit/?id=0391fcad9103abca0796a068f957d0df63ab4776
  after the usage was migrated to oe.utils.conditional:
  http://git.openembedded.org/openembedded-core/commit/?id=c97acbd034532895ce57c6717ed1b3ccc7900b0d
  so we can handle just ".conditional" version

* add 1st parameter to variable dependencies, that way when you use
  FOO = "${@oe.utils.conditional('VAR', 'VALUE', 'true', 'false')"
  FOO variable will have dependency on VAR variable and you don't need
  to add FOO[vardeps] += "VAR" manually every time you use
  oe.utils.conditional

* this is similar to contains tracking from:
  https://bugzilla.yoctoproject.org/show_bug.cgi?id=3890
  http://git.openembedded.org/bitbake/commit/?id=ed2d0a22a80299de0cfd377999950cf4b26c512e
  http://git.openembedded.org/bitbake/commit/?id=0b9d117631ce909312d53b93289e61defc6be01c
  but conditional is simpler, we don't need to handle the first
  parameter as a set

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

lib/bb/cache.py

@@ -37,7 +37,7 @@
 
 logger = logging.getLogger("BitBake.Cache")
 
-__cache_version__ = "151"
+__cache_version__ = "152"
 
 def getCacheFile(path, filename, data_hash):
     return os.path.join(path, filename + "." + data_hash)

lib/bb/codeparser.py

@@ -140,7 +140,7 @@ class CodeParserCache(MultiProcessCache):
     # so that an existing cache gets invalidated. Additionally you'll need
     # to increment __cache_version__ in cache.py in order to ensure that old
     # recipe caches don't trigger "Taskhash mismatch" errors.
-    CACHE_VERSION = 9
+    CACHE_VERSION = 10
 
     def __init__(self):
         MultiProcessCache.__init__(self)
@@ -214,7 +214,7 @@ def flush(self):
         self.buffer = []
 
 class PythonParser():
-    getvars = (".getVar", ".appendVar", ".prependVar")
+    getvars = (".getVar", ".appendVar", ".prependVar", ".conditional")
     getvarflags = (".getVarFlag", ".appendVarFlag", ".prependVarFlag")
     containsfuncs = ("bb.utils.contains", "base_contains")
     containsanyfuncs = ("bb.utils.contains_any",  "bb.utils.filter")