Adding java support for shared thirdparty

Summary: Enable using our shared NFS thirdparty, if available, during the java mvn steps as well.

Test Plan:
Using `mvn clean package`:
- On NFS: `[WARNING] PROTOC: [2018-04-25T02:23:40 common-build-env.sh:1354 find_shared_thirdparty_dir] Using existing third-party dependencies from /n/jenkins/thirdparty/yugabyte-thirdparty-2018-04-17T11_16_55/thirdparty`
- On my mac: `[WARNING] PROTOC: [2018-04-24T19:26:44 common-build-env.sh:1342 find_shared_thirdparty_dir] Parent directory for shared third-party directories ('/n/jenkins/thirdparty') does not exist, cannot use pre-built third-party directory from there.`

Reviewers: mikhail

Reviewed By: mikhail

Subscribers: ybase

Differential Revision: https://phabricator.dev.yugabyte.com/D4675

build-support/common-build-env.sh

@@ -1335,7 +1335,7 @@ read_file_and_trim() {
 
 # In our internal environment we build third-party dependencies in separate directories on NFS
 # so that we can use them across many builds.
-find_shared_thirdparty_dir() {
+find_thirdparty_dir() {
   found_shared_thirdparty_dir=false
   local parent_dir_for_shared_thirdparty=$NFS_PARENT_DIR_FOR_SHARED_THIRDPARTY
   if [[ ! -d $parent_dir_for_shared_thirdparty ]]; then

build-support/jenkins/build-and-test.sh

@@ -287,7 +287,7 @@ fi
 configure_remote_build
 
 if "$using_default_thirdparty_dir"; then
-  find_shared_thirdparty_dir
+  find_thirdparty_dir
   if ! "$found_shared_thirdparty_dir"; then
     if [[ ${NO_REBUILD_THIRDPARTY:-} == "1" ]]; then
       log "Skiping third-party build because NO_REBUILD_THIRDPARTY is set."

java/yb-client/dev-support/build-proto.sh

@@ -39,6 +39,9 @@
 
 . "${BASH_SOURCE%/*}/../../../build-support/common-build-env.sh"
 
+# In case we are on NFS, try to use the shared thirdparty, if possible.
+find_thirdparty_dir
+
 PROTOC_BIN=$YB_THIRDPARTY_DIR/installed/uninstrumented/bin/protoc
 if [[ ! -f $PROTOC_BIN ]]; then
   if which protoc > /dev/null; then

yb_build.sh

@@ -881,7 +881,7 @@ if [[ ${YB_SKIP_BUILD:-} == "1" ]]; then
 fi
 
 if "$use_shared_thirdparty" || [[ -f $YB_SRC_ROOT/thirdparty/.yb_thirdparty_do_not_use ]]; then
-  find_shared_thirdparty_dir
+  find_thirdparty_dir
 fi
 
 configure_remote_build