Install Mbed OS Python requirements

mbed-os-5.15-requirements.txt

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+colorama==0.3.9
+urllib3[secure]==1.24.2
+prettytable==0.7.2
+junit-xml==1.8
+pyyaml==4.2b1
+jsonschema==2.6.0
+future==0.16.0
+six==1.12.0
+mbed-cloud-sdk>=2.0.6,<2.1
+requests>=2.20,<2.21
+idna>=2,<2.8
+pyserial>=3,<=3.4
+Jinja2>=2.10.1,<2.11
+MarkupSafe<2.1
+intelhex>=1.3,<=2.2.1
+mbed-ls>=1.5.1,<1.8
+mbed-host-tests>=1.4.4,<1.6
+mbed-greentea>=0.2.24,<1.8
+beautifulsoup4>=4,<=4.6.3
+pyelftools>=0.24,<=0.25
+manifest-tool==1.5.2
+icetea>=1.2.1,<1.3
+pycryptodome>=3.9.3,<4
+pyusb>=1.0.0,<2.0.0
+hidapi>=0.7.99,<0.8.0;platform_system!="Linux"
+cmsis-pack-manager>=0.2.3,<0.3.0
+pywin32==224;platform_system=="Windows"
+wmi==1.4.9;platform_system=="Windows"
+psutil==5.6.6
+cryptography>=2.5,<3
+Click>=7.0,<7.1
+cbor>=1.0.0