RFR: JDK-8172312 Update docs target and image for new combined docs

[Magnus Ihse Bursie]

On 2017-03-30 21:19, Magnus Ihse Bursie wrote:
>
> New webrev coming up soon... 

Here it is:

http://cr.openjdk.java.net/~ihse/JDK-8172312-combined-javadocs/webrev.02

Changes since last webrev:

  * Removed java.base from DOCS_MODULES and updated comment.
  * Removed jdk.crypto.mscapi and jdk.crypto.ucrypto from DOCS_MODULES.
  * Replaced JAVADOC_SOURCE_DIRS with
     JAVADOC_SOURCE_PATH := $(call PathList, $(call GetModuleSrcPath) \
         $(SUPPORT_OUTPUTDIR)/rmic/* $(JDK_TOPDIR)/src/*/share/doc/stub)
    and added it to JAVADOC_VARDEPS
  * Fixed JAVADOC_TOP indentation
  * Removed java.base from list of modules for reference javase javadoc
  * Updated REFERENCE_TARGET_DIR to $(IMAGES_OUTPUTDIR)/javase-docs/api

/Magnus