LIU-213 docker and plasma shared memory improvements

[calgray]

In https://icrar.atlassian.net/browse/LIU-213 I noticed issues when writing large amounts of data to plasma stores. The primary issue was not allocating enough shared memory to plasma store container.

There is also a performance issue with plasmaIO is how previously bufferOutputStream uses a resizeable staging buffer before copying to plasma memory. Instead it is possible to create a fixed size plasma buffer and copy directly into it to improve drop performance in cases where drop size is known or only a single write is performed at runtime. To continue support of the old behaviour I've added a "use_staging" drop argument which indicates data will be copied to a resizeable buffer first before copying to plasma memory.

[coveralls]

Coverage increased (+0.02%) to 79.227% when pulling 4b888fb on LIU-213 into c18936e on master.