better regexp in CLI tests (#370)

cmd/amp/cli/test_samples/service-list.yml

@@ -2,4 +2,4 @@ service-list:
   cmd: docker service ls
   args:
   options:
-  expectation: ((ID)(\s)+(NAME)(\s)+(REPLICAS)(\s)+(IMAGE)(\s)+(COMMAND)((.)|(\s))+(pinger)(.)+(appcelerator/pinger)(\s)+(.)*)
+  expectation: (?ms)ID[[:space:]]+NAME[[:space:]]+REPLICAS[[:space:]]+IMAGE[[:space:]]+COMMAND.+\n[a-z0-9]{12}[[:space:]]+.+appcelerator/pinger

cmd/amp/cli/test_samples/stats-cpu.yml

@@ -4,4 +4,4 @@ stats-cpu:
     -
   options:
     - --cpu
-  expectation: ((Service name)(\s)+(CPU %%)((.)|(\s))+((.)|(\s)){1,}(.)*)
+  expectation: (?m)Service name[[:space:]]+CPU %%[[:space:]]*\n-+[[:space:]]*\n[a-z]+[[:space:]]+[0-9\.]+%

cmd/amp/cli/test_samples/stats-io.yml

@@ -4,4 +4,4 @@ stats-io:
     -
   options:
     - --io
-  expectation: ((Service name)(\s)+(Disk IO read/write)((.)|(\s))+((.)|(\s)){1,}(.)*)
+  expectation: (?m)Service name[[:space:]]+Disk IO[[:space:]]+read/write[[:space:]]*\n-+[[:space:]]*\n[a-z]+[[:space:]]+[0-9]+.* / [0-9]+

cmd/amp/cli/test_samples/stats-mem.yml

@@ -4,4 +4,4 @@ stats-mem:
     -
   options:
     - --mem
-  expectation: ((Service name)(\s)+(Mem usage)(\s)+(Mem %%)((.)|(\s))+((.)|(\s)){1,}(.)*)
+  expectation: (?m)Service name[[:space:]]+Mem usage[[:space:]]+Mem %%[[:space:]]*\n-+[[:space:]]*\n[a-z]+[[:space:]]+.+[1-9\.]+%

cmd/amp/cli/test_samples/stats-node.yml

@@ -4,4 +4,4 @@ stats-node:
     -
   options:
     - --node
-  expectation: ((Node id)(\s)+(CPU %%)(\s)+(Mem usage)(\s)+(Mem %%)(\s)+(Disk IO read/write)(\s)+(Net Rx/Tx)((.)|(\s))+((.)|(\s)){1,}(.)*)
+  expectation: (?m)Node id[[:space:]]+CPU %%[[:space:]]+Mem usage[[:space:]]+Mem %%[[:space:]]+Disk IO read/write[[:space:]]+Net Rx/Tx[[:space:]]*\n(-|[[:space:]])+\n[a-z0-9]{25}[[:space:]]+