Resolve the issue of LOG_DIR environment variable not working

[liaodn]

The 'export LOG-DIR=$BASE-DIR/logs' in standalone. sh will overwrite the external LOG-DIR environment variable, causing it to not work

[coveralls]

Pull Request Test Coverage Report for Build 17029721154

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 26 unchanged lines in 10 files lost coverage.
• Overall coverage increased (+0.05%) to 63.331%

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Files with Coverage Reduction	New Missed Lines	%
org/apache/bifromq/basecluster/transport/TCPTransport.java	1	87.06%
org/apache/bifromq/basecrdt/core/internal/CausalCRDTInflater.java	1	92.21%
org/apache/bifromq/dist/trie/TopicFilterIterator.java	1	71.37%
org/apache/bifromq/basecrdt/core/internal/InMemReplicaStateLattice.java	2	94.19%
org/apache/bifromq/basecluster/memberlist/AutoDropper.java	3	81.74%
org/apache/bifromq/basekv/raft/RaftNodeStateFollower.java	3	84.16%
org/apache/bifromq/basekv/raft/RaftNodeStateLeader.java	3	85.23%
org/apache/bifromq/dist/trie/STopicFilterTrieNode.java	3	83.95%
org/apache/bifromq/mqtt/handler/MQTTSessionHandler.java	3	75.15%
org/apache/bifromq/basekv/raft/RaftNodeState.java	6	90.95%

Totals
Change from base Build 17008612044:	0.05%
Covered Lines:	23768
Relevant Lines:	36251

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💛 - Coveralls

[popduke]

Thanks, new committer : )