Improve userspace VM management #92
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Occlum is a single-address-space library OS. Previously, userspace memory are divided for each process. And all the memory are allocated when the process is created, which leads to a lot of wasted space and complicated configuration. In the current implementation, the whole userspace is managed as a memory pool that consists of chunks. There are two kinds of chunks: (1) Single VMA chunk: a chunk with only one VMA. Should be owned by exactly one process. (2) Multi VMA chunk: a chunk with default chunk size and there could be a lot of VMAs in this chunk. Can be used by different processes. This design can help to achieve mainly two goals: (1) Simplify the configuration: Users don't need to configure the process.default_mmap_size anymore. And multiple processes running in the same Occlum instance can use dramatically different sizes of memory. (2) Gain better performance: Two-level management(chunks & VMAs) reduces the time for finding, inserting, deleting, and iterating.
Also fix the VM drop process when creating process failure
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