PKG: on develop branch, use latest revision from remote modules

Modules/Remote/SertitObject.remote.cmake

@@ -26,5 +26,5 @@ median, variance, kurtosis, skewness. The result could be use to perform further
 object-oriented image analysis.
 "
   GIT_REPOSITORY https://github.com/sertit/SertitObject.git
-  GIT_TAG 49b6540c774ddb7c2d56e39f6f118c4dfb9b8bd3
+  GIT_TAG master
 )

Modules/Remote/otbFFSforGMM.remote.cmake

@@ -25,5 +25,5 @@ A more detailed description can be found on the project website:
 https://github.com/Laadr/otbFFSforGMM
 "
   GIT_REPOSITORY https://github.com/Laadr/otbFFSforGMM.git
-  GIT_TAG f9aa7988fc399d8713f9e28fac15e637a783be6e
+  GIT_TAG master
   )

Modules/Remote/otbGRM.remote.cmake

@@ -12,5 +12,5 @@ A more detailed description can be found on the project website:
 http://tully.ups-tlse.fr/lassallep/grm
 "
   GIT_REPOSITORY https://github.com/orfeotoolbox/GRM
-  GIT_TAG c53a61d12b895a85c3909130021988730c309cb7
+  GIT_TAG develop
 )